312 CALIFORNIA ACADEMY OF SCIENCES. 



absence of spermathecge in somite viii is of less import- 

 ance and may not prove constant. The spermathec^ in 

 somite ix were of similar size and construction as those 

 in the preceding species, though of somewhat different 

 form. 



The most important characteristics of this species are 

 found in the genital zone and prostates. As has already 

 been stated the outer seta in the inner couple both in 

 somites xvii and xix are missing. The central papilla in 

 the genital zone is smaller than in the preceding species, 

 but otherwise the zones in the two species resemble each 

 other. The sperm ducts are smaller than in the preced- 

 ing species. The prostates are eight in number, longer 

 and more slender than in Kerria McDonaldi. The 

 muscular parts of the prostates are not as narrow as 

 in the preceding form and they are less regular and 

 much shorter. There is no difference between the an- 

 terior and the posterior prostates, except that one prostate 

 in each couple is slightly larger than the other, but I 

 doubt if this is a constant character. 



All the prostates resemble in a general way the pos- 

 terior prostate in the preceding species, the muscular 

 tube in each being comparatively short, gradually in- 

 creasing in size towards the glandular part. The pros- 

 tates are also less pointed. They are contracted several 

 times and rather wavy and irregular in outline with two 

 distinct swellings. All the papillee in the genital zone are 

 less prominent than in Kerria McDonaldi. 



As I found only one specimen and that one being 

 partly damaged, I can give no account of the septal 

 glands, etc. We must look to a larger supply of speci- 

 mens before an extensive description can be made, but I 

 think enough is known to warrant us to arrange this worm 

 as a separate species. 



