80 ’ COMPARATIVE ZOOLOGY. 
Fia. 43.—Anatomy of a Gasteropod (Snail): a, mouth; b, foot; ¢, anus; d, lung; @ 
stomach, covered above by the salivary glands; Jf, intestine; g, liver; h, heart; 
Z, aorta; j, gastric artery; 1, hepatic artery; k, artery of the foot; m, abdominal 
cavity, supplying the place of a venous sinus; , irregular canal communicating 
with the abdominal cavity, and carrying the blood to the lung; 0, vessel carry- 
ing blood from the lung to the heart. 
easy.” Indeed, it is common for Fishes to disgorge the 
indigestible parts of their food, and some, as the Carp, 
0 
1 
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fm mm 
Z 1! i} 
LA yy ae Wy mn MINN) ayn "wn ay i a 
s U k r b 
Fra. 44.—Anatomy of a Lamellibranch (Mactra): a, shell; b, mantle; c, tentacles, or 
lips; a, mouth; e, nerves; f, muscles; g, anterior and, 7, alee Pree h, 
liver; 7, heart; &, stomach; J, intestine passing through the heart; m, kidney ; 0, 
anal end of the intestine; p, exhalent and, q, inhalent a anienioes tobest or si- 
phons; 7, gills; s, foot. 
eae 
