/I 



JTohfhuricr 



B 



JTntedon, Pentacrinus^ 



'- anus 

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

 body is viewed from the oral side, md, 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, to 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 ; Sj, free portion of 

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

 testinal coecum. [Combined from several sources.] 



