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 ; 5. 

 Forbesii. 



FAMILY IV. SYNAPTAD^:. 



Chirodota (Esch.). Body cylindrical, long, 

 slender, without suckers; tentacles long, divided 

 at their tips into finger-like points. 



C. digitate. Fig. 118 ; J. 

 Henslowana. 



Order III. SIPUNCULOIDEA. 



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 . . Sipunculida. 



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 Thalassemada- 



FAMILY I. SIPUNCULIDJE. 



Syrinx (Bohadsch). Proboscis cylindrical, 

 shorter than the "body, having a circle of short 

 fingered tentacles around its tip. 



