240 CALIFORNIA ACADEMY OF SCIENCES. [Proc. 3D Ser. 



three pairs of diverticles, which in this species are much 

 developed. Each diverticle opens independently into the 

 intestine. 



SpermatheccB. — The spermathecge are of large size, each 

 one consisting of a large distal sac and a narrower duct. 

 The pores are in the anterior part of the somite and accord- 

 ingly postseptal. They open into the intersegmental grooves 

 of VII/VIII and VIII/IX. I am unable to state whether 

 the diverticle penetrates the anterior septum. The upper 

 sac-like part has a remarkably thin wall, as thin as the 

 thinnest septum and entirely without columnar epithelium. 

 The muscular duct, however, is thick and furnished with a 

 somewhat pear-shaped diverticle containing from three to 

 several longitudinal chambers which seem to open separately 

 into the muscular duct. 



The testes and ovaries are minutely lobate. 



The sperm-sacs are strongly racemose. The s-perm-ducts 

 run side by side but do not fuse until they reach somite 

 XVII. Here the duct is seen to be strongly muscular and 

 as wide as the prostate, behind which it passes, opening 

 into the same pore. Of the three pairs of prostates, the 

 anterior pair, which opens with the sperm-ducts, is the 

 largest, being of the usual size. It is confined to somite 

 XVII. The upper, glandular part is no thicker than the 

 muscular part and has no distinct glandular cells, though 

 there are two distinct layers of cells. The outer cells are 

 very minute, resembling connective tissue. This unusual 

 structure of the prostate may be due to degeneration. The 

 prostates in XVIII and XIX are about one-half as wide as 

 those in XVII. They open into the equator of their re- 

 spective somites. The one in XIX opens immediately in 

 front of a common setse. These posterior prostates are 

 present on both sides of the worm and possibly are charac- 

 teristic of the species and not accidental proliferations. 



Nephridia. — The nephridia of this species are interest- 

 ing. There are no micronephridia, as in some other species, 

 at least none covered with a coelomic mantle. Anterior to 

 the clitellum the nephridia show a plectonephric condition. 



