CLASS OF CKUSTACEA. 



481 



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

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

 are fixed by their extremity to the inferior margin of the 

 arch of the flancs (Figs. 512 and 514), and are enclosed in 



\ 

 /' / 



Fig. 513. Anatomy of the Crab (Tourteau) ; Common edible Crab.* 



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

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

 artery; aa, abdominal artery; b, branchiae in their natural position; b', 

 branchiae, reversed externally, to show their afferent vessels ; Ji, arch of the 

 flancs ;f, flabelliform appendix, or epignathus of the limb-jaws ; f, stomach ; 

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

 I I 



