

LINET7S. 271 



B. HOLCRHYNCHOCOELOMIA. 



Body usually short. Proboscis at least as 

 long as body. Proboscis sheath reaches into 

 hinder third of body. 



Fam. Teteastemmid^e. 



Four eyes. Cerebral organs in 

 front of brain. Dioecious or 

 hermaphrodite. 



Genera. Prosorochmus. 

 Tetrastemma . 



Fam. Amphiporie-^e. 



Numerous eyes. Cerebral organs 

 generally behind brain. As a rule 

 members of this family are con- 

 siderably larger than those of the 

 preceding. 



Genera. Amphiporus. 



Drepanophorus. 



Fam. Malacobdellieve. 



Parasitic in Lamellibranchs. 

 Sucker at posterior end. 

 Genus. Malacobdella. 



IV. HETERONEMERTINI. 



Three muscle layers in body wall, i.e., outer 

 longitudinal, middle circular, and internal longi- 

 tudinal. Proboscis without stylets. Mouth 

 behind brain. 



Fam. Eupolttd.e. 



Without head slits. 

 Genera. Eupolia 



Valencinia. 

 Oxypolia. 



