136 CALIFORNIA ACADEMY OF SCIENCES. [Proc 3U Ser. 



Nomenclature. — For convenience sake I have here 

 adopted the definition by Beddard and referred the present 

 species to Eudrilus Etigenim (Kinberg), though I am satis- 

 fied that there are differences sufficient to warrant the mak- 

 ing of at least a new variety. In a species so widely 

 distributed as Eudrilus Eugenics we may expect to find 

 interesting variations. In the following pages I have noted 

 down the principal anatomical differences between my spec- 

 imens from Panama and those upon which Beddard bases 

 his definition; there are also added some observations on 

 the finer anatomical and morphological structure. 



External Characters. 



Body. — (figs. 27-34). The body of the worm tapers 

 gradually towards the tail which is very thin and pointed. 

 Length from 120 to 150 mm. Color reddish to violet 

 brown above, with fine and strong violet iridescence. 

 Below yellowish white with some iridescence. 



Somites. — (figs. 27, 28). The prostomium divides somite 

 I about one-half to two-thirds. Somite II is about one- 

 fourth smaller than I or III ; somite III is about one-third 

 smaller than IV; and IV is somewhat smaller than II and 

 III combined. Somites III, IV and V are somewhat longer, 



Nej^hro^ores. — The most anterior pore is in VI, in front 

 of set£e cd. The pores in X to XIII are surrounded by an 

 elevated glandular ring. 



The ovifores are in front of cd in XIV. 



Co-pulatory Organ. — (figs. 29-33). The male pores are 

 found in the posterior part of somite XVII in line with set£e 

 ah. There is a very large eversible bursa-copulatrix into 

 which open the penis and the copulatory papilla. On this 

 papilla we find the external pore of the Y-gland, while at 

 the apex of the penis we find the opening of the prostate 

 duct. When the bursa-copulatrix is retracted, the end of 

 the penis projects through the opening of the male pore. 

 When this bursa is everted the whole penis, as well as the 



