138 



ZOOLOGY. 



lobsters, and all Crustacea of analogous organization, the 

 branchiae consist of a considerable number of small cylinders, 

 disposed like the bristles of a brush, or of small lamellae, 

 piled on each other like the leaves of a book. These organs 

 are fixed by their extremity to the inferior margin of the 



t 



Fig. 427. Anatomy of the Crab (Tourteau).* 



* The greater part of the carapace baa been removed : t, portion of the 

 cutaneous membrane lining the carapace ; c, the heart ; oo, ophthalmic 

 artery ; aa, abdominal artery ; b, branchiae in their natural position ; I 1 , 

 branchiae, reversed externally, to show their afferent v-s>cls ; Jt, arch of the 

 flancs ; f, flabeUiform appendix, or epignathugof the limb-jaws j e, stomach; 

 m, muscles of the stomach; Jo, the liver. 



