SIPUNCULID.E. 73 



Family III. Psolid^e. 



Psolus (Oken). Body irregular, mollusk-like ; 

 suckers in five rows, three of which only are de- 

 veloped, and placed on a soft disk or foot; tentacles 

 ten. 



P. phantapus. Fig. 117 ; J. 

 Forbesii. 



Family IV. Synaptad^:. 



CMrodota (Esch.). Body cylindrical, _ long, 

 slender, without suckers; tentacles long, divided 

 at their tips into finger-like points. 



C. digitata. Fig. 118 ; §. 

 Henslowana. 



Order III. SIPUNGULOIDEA. 



With a retractile proboscis, at the base of 

 which is placed the vent, and round the ex- 

 tremity of which is a circle of tentacles . . Sipunculidce. 



With a retractile proboscis, with no tenta- 

 cles ; the vent at the end of a long thread- 

 like tail Priapulidce. 



With a proboscis, which has a long fleshy- 

 appendage attached ; no tentacles ; the vent 

 at the hinder extremity Thalassemadce. 



Family I. Sipunculidce. 



Syrinx (Bohadsch). Proboscis cylindrical, 

 shorter than the body, having a circle of short 

 fingered tentacles around its tip. 



