AN ATTEMPT TO CLASSIFY EAETHWORMS. 281 



placed in a deep median fossa, and with the exception of 

 T. schlegelii they each have two gizzards. It is to be 

 regretted that the " law of priority " is so frequently dis- 

 regarded. The name Trigaster^ though losing its struc- 

 tural significance^ has every right to be retained as a generic 

 title. The new genera appear to belong to my family 

 Eudrilidae with one exception; but it is a pity that more 

 figures, in illustration of the very curious arrangement of the 

 genital system in some of these^ have not been given. I have 

 diagrammatised four of these genera. 



1. Pygraseodrilus. 



Setse in four couples. 



Clitellum complete, round Somites xiv, xv, xvi. 



Male pores paired on Somite xvii. 



Nephridiopores in front of the outer couples of setse. 



The male apparatus resembles that of Eudrilus, but the 

 female system is not aberrant [for further characters see 

 fig. 33]. 



Species. — P. quilimauensis ; from Quilimane. 



2. Eudriloides. 



Setse in four couples. 



Clitellum complete, on Somites xiv to xviii. 



Male pore single, median, on Somite xvii. 



Spermathecal pore single, median, between Somites 

 xiii/xiv. 



There is no direct communication between oviduct and 

 spermatheca. 



Penial setae and dorsal pores are present. 



The details given are insufficient to diagrammatise. 



Species. — E. parvus and E. gypsatus. 



3. Nemertodrilus. 

 Setae in four couples. 

 Clitellum on Somites xiii to xviir. 

 Male pores paired between Somites xvii/xviii. 

 "Spermathecal" (?) pores paired on Somite xiii. 



VOL. XXXI, PART II. NEW SER, T 



