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



Sfermathecce. — (fig. 57.) The two spermath.ec£e open 

 in front of the ventral setge, half-way between them and the 

 septum in somite IX, The muscular duct is somewhat less 

 in length than the pouch. The walls of the latter consist 

 .of an inner epithelium of very narrow glandular cells, in 

 which we can distinguish a very large ciliated discharge- 

 pocket adjoining the nucleus. The spermatheca contains 

 not only spermatozoa but also spermatocytes and spermato- 

 gonia, having one, two and four nuclei, together with a fine 

 granular secretion. 



Testes. — There is only one pair in XI. In longitudinal 

 sections the tests are slightly racemose. 



Sperm-sacs. — There is one pair of elongated, well defined 

 sperm-masses in XI, projecting forwards in that somite. 

 They are not surrounded by peritoneum. The real race- 

 mose sperm-sacs are in XII. They project from the pos- 

 terior surface of septum XI/XII, closely surrounding the 

 intestine. 



Sperm-ducts and Funnels. — Only one pair of ciliated 

 sperm-funnels and one pair of sperm-ducts. The funnels 

 are large, situated in XI. The sperm-ducts run directly 

 backwards to the male pore in XVII, where they open close 

 to the prostate pores and on the same elevated papillae. 



Prostates. — These organs are larger than in any other 

 species of the genus known. They extend through some 

 sixteen somites and are folded on themselves at the distal 

 end, and would if stretched out extend through three or 

 four more somites. They increase slightly in width from 

 the pore to somite XXXIII; but decrease from that point 

 to the apex. There is a muscular and a glandular part. 

 The muscular part consists of a row of glandular cells, a 

 narrow muscular layer of a few strands, a connective tissue 

 layer with rather large nuclei, and a narrow peritoneal layer 

 of small cup-shaped cells. The nuclei of the latter are 

 small and stain very dark. Towards the distal end of the 

 muscular part the connective tissue layer decreases in size, 



