. Beginners' Zoology . Fig. 199. — Oyster. C, mouth; a, vent; g,g,ganglia; 7nt, mantle; b,gill. drawings of their shells. The slug. Fig. 200. — Trochus. is very similar to the snail exceptthat it has no shell. If the shell of the snail shown inFig. 202 were removed, there would be left a very good representation of a slug. Economic Importance ofMollusca. — Several speciesof clams are eaten. One ofthem is the Jiard-sJiell clam(quahog) found on the At-lantic coast from Cape Codto Texas. Its shell is white. It often burrows slightlybeneath the surface. The soft-shell clam is better liked asfood.

---

. Beginners' Zoology . Fig. 199. — Oyster. C, mouth; a, vent; g,g,ganglia; 7nt, mantle; b,gill. drawings of their shells. The slug. Fig. 200. — Trochus. is very similar to the snail exceptthat it has no shell. If the shell of the snail shown inFig. 202 were removed, there would be left a very good representation of a slug. Economic Importance ofMollusca. — Several speciesof clams are eaten. One ofthem is the Jiard-sJiell clam(quahog) found on the At-lantic coast from Cape Codto Texas. Its shell is white. It often burrows slightlybeneath the surface. The soft-shell clam is better liked asfood. It lives along the shores of all northern seas. Itburrows a foot beneath the surface and extends its siphons

---

Size: 1998px × 1251px
Photo credit: © Reading Room 2020 / Alamy / Afripics
License: Licensed
Model Released: No

Keywords: ., bookcentury1900, bookdecade1920, bookidbeginnerszoo, bookyear1922