PACIFIC COAST OLIGOCHiETA. 141 



Giz7.nrd is in v. 



Cnlciferous diverticula, three pair.s, one each in vii, viii and ix, all of the same 

 structure. 



Sacculated intestine commences in xix and fnrnished with a typhlosole. 



Spermathecdi in viii and ix with a few warty diverticula, one of which is 

 larger and furnished witli two swellings. Spormathecal pores in front of setie 1 and 

 2. The spermathecie are large, fdling the space between the sci)ta on the ventral side 

 of the body. No spermathecal copulary seta>. 



Sperm-sacs sac-like, not racemose, occupying the whole space left in ix-xii. 



Prostates much folded, opening with penial setse; each pro^^tate confined to 

 one somite each, the free distal end pointing backwards, and situated close behind the 

 male pore. 



Nephridia, sti'ictly meganephridia, not alternating. 



DETAILED DESCRIPTION. 



Each prostate pore is situated on a round globular papilla, between which and 

 the male pore runs a copulatory fossa. In xvi and xx there is in each a copulatory 

 ridge, running parallel with the intersegmental grooves and somewhat longer than the 

 space between setse 2 and 2 (fig. 91). There is a shorter ridge in xviii extending 

 between the male pores. 



The prostomium and somites i and ii are transversely sulcated, most so somites 

 i and ii. Also somite iii shows this sulcation in a smaller degree. The anterior nine 

 somites are more or less distinctly segmented in three parts, that is, they show a central 

 ridge on which are situated the setse. The following posterior somites show a seg- 

 mentation in five parts. In the clitellium the segmentation is clear, as far as regards 

 the intersegmental grooves, but the segmentation of the somites is not very distinct. 



The siq^ra-phnrijngeal glands form a very large body, superposing the pharynx. 

 It is rounded posteriorly, and consists of four larger and five smaller lobes, this when 

 viewed in a longitudinal section just outside the median line (fig. 96). 



The calciferous diverticula show all the same structure. 



The sperinathecre are large, globular masses, as seen in figs. 94 and 95, with 

 warty diverticula, one of which is much larger. The spermathecte overlap each other 

 and are bunched in a solid mass between the septa on the ventral side of the body. 



Testes are in two pairs, quite or very small when viewed in sections — in x and 

 xi, in front of the ciliated rosettes, on the posterior face of the anterior septa. 



The ciliated rosettes or sperm-funnels are in xi and xii, and are very large, 

 crimped and furnished with a wide muscular duct. The funnels in xii lie much 

 higher up than the one in xi, much closer to the intestine. The posterior part of the 

 funnel is very thick, and so is the duct. The ducts join and open as usual in xviii. 

 The rosettes lie free, but are connected by connective tissue with the anterior septa. 

 They thus point backwards. 



The body-ivall is very thick, and the longitudinal muscles are not bipinnately 

 arranged. The septa between v, vi and so on until xi, xii, are much thickened, and 

 thicker than the other, though the one between xi, xii is not as thick as the anterior 



