1902.] 



NUDIBRANCHS PROM ZANZIBAR. 



67 



agree in shape. Those neai^est 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 outeimost 

 are degraded. ^ On the oesophagus lies a large gland of apparently 

 salivary functions. The esophagus, 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 irregularly 

 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 carefully examined have rather the appearance of 

 veins, to the base of the wings and rhinophores. 



Text-fig. 4. 



amp.$ gl. 



Hermaphrodite gland of Crosslandia viridis. 



amp. ^ffl., ampulla of hermaphrodite gland. 1 m.c/l., mucous gland. 

 ^ffl, one of the three portions of the sp., spermatotheca. 



hermaphrodite gland. | v.d., vas deferens. 



The ganglia in the central nervous system are distinct, the 

 pedal being ventral to the oesophagus. 



5* 



