First lesson in zoology : adapted for use in schools . Fio. 6S.—The round clam, or quohog (natural size), with the siphon (s) thrust out, showing the tentacles; also the scalloped edge of the mantle (M), and the large foot (/): ; lig, ligament; A, beak. its shell is thicker, and thus more of a protection from itssnemies. We see that the shell is also wedge-shaped, the morerounded end being the head-end, which goes into the sandfirst. If we look at the shell from in front, we see the distinctlarge beaks, and below it a heart-shaped hollow, called the lunule ; also on the upper edge the
First lesson in zoology : adapted for use in schools . Fio. 6S.—The round clam, or quohog (natural size), with the siphon (s) thrust out, showing the tentacles; also the scalloped edge of the mantle (M), and the large foot (/): ; lig, ligament; A, beak. its shell is thicker, and thus more of a protection from itssnemies. We see that the shell is also wedge-shaped, the morerounded end being the head-end, which goes into the sandfirst. If we look at the shell from in front, we see the distinctlarge beaks, and below it a heart-shaped hollow, called the lunule ; also on the upper edge the large ligament(Pig. 62j lig). Opening the valves, we see that there are THE CLAM AND OTHER BIVALVED SHELL-FISH. 63 three teeth in the right and two in the left Talve, while thehinge-margin is yery solid. We also see the muscular im-pressions, which are connected by the pallial line. Theedge of each valve is purple. This part of the shell was Siphon. Fio. 68. —Unio, or fresh-water mussel, with its large foot partly buried in thesand, the siphonal openings above the level of the river-bottom. used by the Indians in making beads for money, or wam-pum. The inland student who cannot readily obtain live sea-clams should pick up the mussels from the edge of pondsand rivers, carry them home, put them into pans of water.
Size: 2046px × 1221px
Photo credit: © The Reading Room / Alamy / Afripics
License: Licensed
Model Released: No
Keywords: ., bookcentury1800, bookdecade1890, booksubjectzoology, bookyear1894
