1902. 



XUDIBRANX'HS FROM ZAXZIHAR. 



67 



agree in sliape. Those nearest the rhachis are generally denti- 

 culate on both sides : the ordinary teeth are denticulate only on 

 the external side : those towards the end of the row are again 

 denticulate on both sides but of a peculiar form ; the outermost 

 ai-e degraded. On the cesophagus lies a large gland of apparently 

 salivary functions. The oesophagus, which is narrow, broadens at 

 this gland, and the digestive tract continues of much the same 

 length until near its termination. On slitting it open (text-fig. 2, 

 p. 65) the traces of a stomach are found, and an internal con- 

 striction is caused by the presence of a ring of large horny teeth. 

 Just beyond this point is a large typhlosole with an ii-i-egularly 

 laminated interior surface. The anus is lateral, beneath the 

 right wing. The liver is in two compact masses, anterior and 

 posterior ; they send forth very slender light green diverticula, 

 which until carefuUy examined have rather the appearance of 

 veins, to the base of the wings and rhinophores. 



Text-fio-. 4. 



amp.^ gl. 



v.d. 



Hcmiapliroclitt! gland of Crosslomlia viridis. 



amp. 5,9'., ampulla of hermaphrodite gland. 

 ^ffl., one of the three portions of the 

 hermaphrodite gland. 



m.gl., mucous gland. 

 sp., spermatotheca. 

 v.d., vas deferens. 



The ganglia, in the central nervous system are distinct, the 

 pedal being ventral to the oesophagus. 



5* 



[7] 



