294 CALIFORNIA ACADEMY OF SCIENCES. 



the ventral ganglion in somites xvii, xviii and xix, and 

 which covers the ventral couple of seta?. Testes in x. 

 Sperm-sacs present. Clitellum covers the male zone, but 

 is not developed ventrally. Setct are sigmoid, eight on 

 every somite in couples of twos. 



Kerria McDonald! n. sp. 



Figs. i-ii. 12-19, 21-27. 



The size of the worm is about one inch by i line, the an- 

 terior part of the body is considerably thickened as far 

 as to somite ix, the following somites, towards the 

 clitellum are much narrower. Clitellum covers somites 

 xiv to XX. Four septal glands in somites v, vi, vii and 

 viii, the anterior of which is the largest, the posterior one 

 the smallest. No gizzard. Sacculated intestine com- 

 mences in somite xii. Spermathecie two pairs, one pair 

 in somite viii and one in ix, with diverticula when fully 

 developed. Testes one pair in x, connecting with 

 the sperm-sacs in the same somite. There are one pair 

 of sperm-sacs in x, one pair in xi and sometimes a very 

 minute one in xii. Ciliated rosettes in x. Sperm 

 duct opens independently of the prostates in xviii in an 

 independent pore. The sperm duct is cylindrical, of 

 even width throughout with no enlargements. Two pair 

 of prostates, each prostate opening in an independent 

 porus. The prostates are short, about as long as the 

 worm is wide, much bent and twisted, of varying length 

 and of somewhat varying shape. There are a muscular 

 and glandular part, the latter consisting of a single row 

 of glandulous cells. 



Set^ are sigmoid, those of the inner or genital couples 

 in somites xvii to xix are about '3 smaller than all other 

 setce, this referring to those in the same somites as well as 

 to those in other somites. All the seta? in the genital zone 



