95 



pedal f^an.f^lia are fused to^^ethor, the cerebral, separated 

 from eacli other by a lon/^ con-inissure. T:\n snwll "anterior 

 Canclion" innervates the kidneys, genital organs, and os- 

 ph.ralium in part. On the j^enital rlnct is an or^an of spe- 

 cial sense, oi' unknown function. The sensory colls of the 

 osphradiuni li^ >^eneath the surface ei^ithelium. Their 

 peripheral ends penetrate the epithelial layer, and break 

 up into brush-like toi'minat ions on its surface. 



The kidneys lie dorsal to the pericardial cavity. 

 The main secretory ^■■.-.'t it: much pouched and lies on the 

 posterior adductor muscle. It is connected v/ith the pos- 

 terior ends of the pericardial cavity by a very long, nar- 

 roY/ duct, and with the exterior by a very long, larger 

 duct ' i ■:■! opjns under the visceral ganglion. 



In the adult Teredo, the sexes are separate, iiow- 

 ever, young individuals (1-4 cm. long) of X. fimbriata aro 

 very frequently hennophrodite ; in all siacli cases the spenns 

 are always developed first, indicating that the species 

 may be protandrous. The sexual duct is very short and is 

 formed as an ectodennal invagination. 



