R 

 Hblofhuricr 



JTntedon, Pentacrmus. 



anas 



x anus 



FIG. 382. Diagram of the course of the alimentary canal in various Echinoderms. The 

 body is viewed from the oral side, rnd, ms, Mesenteries ; as, food-grooves or ambulacral furrows 

 of the tegmen calycis ; m, madreporite ; x, commencement of the backward coil of the intestine ; 

 ii first, L 2 second (backward) coil of the intestine ; s, siphon, accessory intestine ; 1 and 2 (in F) 

 the two points at which the accessory intestine enters the principal intestine ; i, free portion of 

 the accessory intestine ; so, portion of the same in contact with the principal intestine ; coec, in- 

 testinal ccecum. [Combined from several sources.] 



