80 CALIFORNIA ACADEMY OK SCIENCES. 



The miiiii s|)erinathcca is stroiif^ly miiscular, csptjciully at its lower end where 

 the muscular layer is iiiuoh thicker than the inner epithelial cells. These latter are 

 larse with oval nuclei. Outside of these cells and between thoni and the muscular 

 layer are seen a row of inter.stitial nuclei of much smaller size than the nuclei of the 

 epithelial cells (fig. 56 infnx. v.) The structure of the diverticulum is somewhat 

 different. Interiorly we find largo epithelial cells with large round nuclei. Outside 

 of them is a single row of interstitial nuclei. Surrounding them we find a circular 

 muscular layer varying in thickness (fig. 57, c. in.) and with few, small nuclei. 

 Exterior to this layer are seen numerous blood vessels, and outside of them a two or 

 three cells thick layer of glandular cells {gl. c.) 



When the body of the worm is viewed from tiic iiitciior, with the alimentary 

 canal removed, the spermatheca as well as their diverticula are seen to extend back- 

 ward, parallel with the ventral ganglion. The diverticulum is always much shorter 

 and narrower than the spermatheca proper. 



Testes and Ovaries. The former organs consist of two pair of mimite narrow- 

 lobed bodies (fig. 29, t. 59, GO), the lobes being all in one plane, parallel to the body- 

 wall. One pair are in x and one in xi as usual. 



The ovaries consist of one pair of flat bodies with wavy margin and wide and 

 shallow lobes, distributed in both a horizontal and vertical plane (figs. Gl and G2). 

 As usual the ovaries are in xiii. 



The oviduct is placed as usual with the funnel in xiii and the pore in xiv. The 



funnel part is very thick, fig. G:3 drawn from a longitudinal section. 



Ciliated rosettes, Spermducis and Prostates. There are as usual two j)air of 

 ciliated rosettes in x and xi opposite the testes. The funnels are very thick and not 

 much erimpled or hardly crini|)led with one flare on either side. The epithelial nuclei 

 are quite long, and their cells are superposed a thick layer of very distinct blood 

 vessels (fig. 65, cr. 66 and 67). The spermducts unite to a single duct which passes 

 immediately outside of the second setie. 'J'he duct is unusually narrow, the narrowest 

 I have seen in any species of this size. The spernuluct enters the glandular part of 

 the pro.state just above the intersegmental groove separating xviii/xvii (fig. 42, sj)d.; 

 68, sjnl) 



The prostate is tubular, very large, bent upon itself once. Tt starts from the 

 male pore, which is situated in the center of xviii, forwards, running parallel with 

 ventral nerve cord. When it reaches xvii it turns liaekwanl, its apex being in the 

 center of xviii. The prostate consists as usual of two distinct parts, connected in the 

 center of xvii. The advancing part is strongly muscular, the returning part again is 

 glandular. The prostate is cylindrical, the two halves being almost equal in thickness. 

 The part which penetrates the muscular body-wall is several times thinner than the 

 other part. The muscular part consists of two layers, the inner one consisting of a 

 row of e])ithelial cells with oblong nuclei. The outer layer, which is very thick, con- 

 sists entiiciv of circulai- miiseles with a few small nuclei. 



