88 



tion throu<3h the visceral gangii 

 reasonable to expect. 



:e one it sooms 



j . The Kidneys. 



The kidneys (orj^ans of Bojanus, nephridia) of Teredo 

 were observed, apparently, by Deshayos , but mistaken for 

 veins. Quatrefages also observed them but gave no ade- 

 quate dosci'iption. Pelseneer (14) has noted the position 

 and relations of the openings of the tv/o ducts. 



In the adult "Ship-worm" the paired kidneys lie on 

 the dorsal side of the large pericardial cavity and ven- 

 tral to the anal canal, extending the long distance be- 

 tween the posterior adductor muscle and the visceral gan- 

 glion. Each kidney consists of what may l^e termed the 

 body, which lies around the posterior face of the poste- 

 rior adductor mtiscle (k. , fig. 10); and two very long ducts, 

 one of v/^hich puts the body in communication with the peri- 

 cardial cavity, v/l.ile the otlier leads to the exterior, "i"^"^ 



