17. 



point just heneatli the pericardiiam, makes a forward turn, coTnes 

 very near the sirrface on the right side, followe the edge of 

 the genital mass and digestive gland nearly to the anterior ad- 

 ductor muscle, then turns dorsal ly and posteriorly, gradually as- 

 sumes a median position again, passes througli the ventricle, and 

 opens into the mantle chamber at the base of the er-chalent siphon, 

 just behind the porterior adductor muscle. Ihe intestinal 

 epithelium is composed of short, deeply-staining cells, which are 

 frequently arranged in longitudinal ridges. One of these ridges, 

 rather more prominent than the others, occupies the position of the 

 tjrplilosole. 



DIGESTIVS GLAHDS. 

 The digestive glands consist of a pair of racemose 

 glands, the ducts from which open into the stomaod^ near its dorsal 

 end. The lobes are very numerous and form a rather compact 

 mass, in the dorsal region of the body, which laterally over-w- 

 hangs the dorsal part of tlie foot. 



LABIAI. PALPS. 

 Figures 3 arxd 5, Ip. 

 Ihe palps of the adult an.inal are very large, figure 3, 

 Ip. Each united pair is suspended from the body wall by a thin 



