482 



ZOOLOGY 



SECT. 



condition it enters the pharynx of the female and when sexually 

 mature establishes itself permanently in the nephridium. 



PseudoboneUia is nearly related to Bonellia, but has two anterior 



neph.fun 



unt.neph 



ov 



post.rieph. 



FIG. 397. Bonellia, general view of the internal organs. 

 an. anus ; ant. neph. anterior nephridium:; int. intestine ; 

 FIG. 396. Bonellia viridis, entire neph. fun. uephrostome ; oes. oesophagus ; ov. ovary ; 

 animal (female) with the prohoscis ph. pharynx ; post, nejilt. posterior nephridium ; prob. 

 moderately extended. (After Greet'.) proboscis; rent. vess. ventral vessel. (After Ureef.) 



nephridia (uteri). The degenerate male, which has no setse, lies in 



a median pit opening on the ventral surface between the two uteri. 



Hamingia has a general resemblance as regards the female to 



Thalassema, but there are no setse. There are two anterior 



nephridia. The male, which has two setae, is 

 degenerate and parasitic in the female, as in 

 Bonellia. 



Acantkohamingia has eight small setse. 

 Epiihetosoma has an extremely long filiform 

 proboscis which, unlike that of the other 

 genera, is hollow, containing a prolongation 

 of the crelome. There are no setse. There is 

 a single nephridium and no anal vesicles. 



In Saccosoma both proboscis and setse 

 appear to be absent. The male is not known. 



FIG. 398. One of the cili- ' * . m; i ,t T7 1 , ,]>;,,, ,-, 



ated funnels of the poste- Development. - Ihe larva 01 Jlicniurus 

 (AneV e i1mS n ' :clliUII1S ' ( Fi - 40 ) luis a well -developed pro-oral 



