Hermit Crabs in Sandwich: How Shedding Old Shells Mirrors the Search for New Homes

What Hermit Crabs Are in Sandwich

Hermit crabs appear throughout Catherine Newman's Sandwich as small, recurring beach creatures the family encounters during their annual Cape Cod vacation. They are first mentioned in the narrator's recollection of the “true kid years,” when children were “still thrilled about seashells, hermit crabs, and the bubblegum eyeballs on the SpongeBob Squarepants popsicle.” But the symbol deepens in Chapter 9, where Willa collects them in her pail and the narrator recalls the summer Jamie was eight and watched crabs swap shells in a shallow pool the children had dug.

The Shell-Swapping Scene: A Fitting Room on the Beach

The novel's central hermit crab image comes from a childhood memory. When Jamie was eight, the children dug a wide, shallow hole, filled it with water, and dumped in dozens of hermit crabs. Jamie tossed in an empty sea-snail shell, saying, “In case anybody wants a new outfit!” The narrator initially doubted it would work—“I don't think it works like that”—but she was wrong. The pool became “the fitting room of Filene's Basement,” with crabs shimmying out of their shells, “pinkly naked as a tiny boiled shrimp,” backing into the spare shell, and reaching around with their claws to check the fit. It became “musical chairs,” with crabs trying on one shell and then another, returning to their originals, and popping out again, until only a single empty shell remained—one with a hole in it and a barnacle bulging from its top. “They left the worst shell!” Jamie observed, amazed.

This scene is remarkable for several reasons. First, it shows the narrator being wrong about how the natural world works—a small but meaningful reversal. Second, it captures the children's pure enthusiasm, which the narrator contrasts with her own vigilance: “In the kids' memory of this moment—their own enthusiasm as pure and bright as a shooting star—I am probably checking them for ticks.” The memory is filtered through the narrator's self-deprecating awareness that her experience of the moment was different from her children's.

What the Shell-Swapping Means

The hermit crab's need to find a new shell as it grows is a natural metaphor for human transitions—outgrowing old identities and searching for new ones. In the context of Sandwich, this resonates on several levels:

For the children: Jamie and Willa are both in transition. Jamie is establishing his career and relationship with Maya; Willa is finishing college and, by the novel's end, preparing for her own wedding. The crabs' willingness to try on new shells—and to return to their originals if the fit isn't right—mirrors the tentative, experimental quality of young adulthood.

For the narrator: Rachel is in a different kind of transition. She is navigating menopause, the emptying nest, and her position in the sandwich generation between her grown children and aging parents. The crabs' shedding of old shells resonates with her own sense of bodily change and identity shift. Her body is “a dangerous reproductive neighborhood,” as she puts it, and the crabs' exposed, vulnerable nakedness during shell-swapping echoes her own feelings of exposure and fragility.

For the family: The annual vacation itself functions as a kind of shell—a container the family returns to each year, which has held them through different stages. The cottage, the beach, the traditions (stelline pasta, the book sale, the ice cream truck) are all shells the family inhabits together. The crabs' search for new homes mirrors the family's own negotiations around change: Willa's engagement, Jamie's relationship, the parents' aging.

The “Worst Shell” and What Gets Left Behind

The detail of the leftover shell—the one with a hole and a barnacle—is significant. After all the crabs have tried on and discarded various shells, the one that remains is the least desirable. This suggests that not every transition ends in a perfect fit. Some shells are damaged, some are abandoned. The image connects to the novel's broader meditation on loss: the narrator's history of reproductive loss, her grief over her children growing up, her mother's eventual death. Not everything gets a new home; some things are simply left behind.

Willa's Collection: Tenderness and Connection

In the present-day scenes, Willa collects hermit crabs with a gentleness that contrasts with the narrator's childhood vigilance. She wades through the shallows, “bending down to scoop up the hermit crabs that are scuttling away,” and holds them close to her face, talking to them gently: “Hello, little friend!” This is a different relationship to the creatures than the children's earlier, more chaotic shell-swapping experiment. Willa's approach is individual and tender—she meets each crab as a separate being.

This tenderness connects to Willa's character more broadly. She is the one who notices the narrator's distress, who defends her mother's worrying, who asks “You good, Mom?” when she senses something is wrong. Her care for the crabs mirrors her care for the people around her.

By the end of the novel, when the family shares their favorite moments from the vacation, Willa names “hermit crabs and night swimming” as her highlights. The crabs have become part of her memory of this particular summer—a summer that includes her engagement and her transition toward marriage.

Connections to Themes

The hermit crab symbol connects to several of the novel's central themes:

The sandwich generation: The narrator is caught between caring for her children and her aging parents. The crabs' constant movement between shells—never quite settled, always looking for the next fit—mirrors this in-between position. See the sandwich generation and caregiving across generations.
Menopause and the aging female body: The narrator's body is changing in ways she can't control. The crabs' vulnerable nakedness during shell-swapping echoes her own sense of bodily exposure and transformation. See menopause and the aging female body.
Marriage and emotional labor: The narrator and Nick's ongoing negotiations about feelings, sex, and communication are themselves a kind of shell-swapping—trying on different ways of being together, returning to old patterns, searching for a better fit. See marriage and the negotiation of emotional labor and truth.
Family secrets and disclosure: The narrator's hidden griefs are like shells she carries without showing. The crabs' willingness to expose themselves during shell-swapping contrasts with the narrator's tendency to conceal. See family secrets and the ethics of disclosure.

Study Questions

1. How does the hermit crab shell-swapping scene in Chapter 9 function as a metaphor for the novel's treatment of change and growth?

The scene shows creatures outgrowing their homes and actively seeking new ones, trying on options, and sometimes returning to what they had. This mirrors the novel's characters at various stages of transition: Willa moving toward marriage, Jamie building a life with Maya, the narrator navigating menopause and the empty nest, and the parents aging. The narrator's initial doubt that the crabs would swap shells—and her being proven wrong—suggests that change is more possible than we expect.

2. What does the “worst shell” left behind at the end of the shell-swapping scene suggest about loss and imperfection?

The leftover shell—with its hole and barnacle—represents what gets left behind in transitions. Not everything finds a new home; some things are damaged or abandoned. This connects to the novel's broader meditation on loss: the narrator's reproductive losses, her grief over her children's growing up, and ultimately her mother's death. The image suggests that imperfection and loss are inevitable parts of change.

3. How does Willa's relationship to hermit crabs differ from Jamie's childhood relationship to them, and what does this reveal about her character?

Jamie's childhood approach was communal and experimental—dumping dozens of crabs into a pool and watching them interact. Willa's approach is individual and tender—scooping up individual crabs, holding them close, speaking to them gently. This reflects Willa's character: she is attentive to individual needs, emotionally perceptive, and caring. Her gentleness with the crabs mirrors her care for her mother and family.

4. How does the hermit crab symbol connect to the novel's treatment of the family's annual vacation?

The vacation itself functions as a kind of shell the family inhabits each year. The cottage, the beach, the traditions—these are containers that hold the family through different stages of their lives. The crabs' search for new shells mirrors the family's own negotiations around change: Willa's engagement, Jamie's relationship, the parents' aging. The vacation is both a return to a familiar shell and an opportunity to try on new ways of being together.