52 CALIFORNIA ACADEMY OF SCIENCES. 
Spermducts and prostates (figs. 103 to 115). There are two pair of sperm funnels 
and ducts, the ducts joined together. The ciliated rosettes or sperm funnels are 
found in x and xi. The anterior pair is engaged in the sperm-sac of that somite 
(fig. 97), while the posterior pair is generally free (fig. 98). I have, however, seen 
the sperm-saes attached to the funnels in these somites in some specimens, and there 
appears in this respect to be considerable variation; generally, however, the rosettes 
are free (fig. 98) in somite xi. Also with the anterior funnel there is some variation. 
In some specimens the funnels were entirely enclosed in the sperm-sacs, in others the 
sperm-sac was merely attached to the free surface of the funnel, while in others again 
one-half of the funnel was imbedded in the sperm-sac, while the other half was free. 
Figs. 97 and 98 show cross-sections with the sperm funnels or ciliated rosettes free or 
imbedded. 
The spermducts join in xii and continue in a direct line to the prostate, which 
they enter in somite xvill. The point of junction is in the lower part of the glandular 
part close to the muscular duct (fig. 86, e.). The duet runs between the very thick 
vascular layer and the longitudinal muscular layer of the body (figs. 117 and 118, sp.). 
The two ducts are never fused together, but continue distinct and separate, though out- 
wardly joined, as to the very entrance in the muscular part of the prostate (figs. 112 
and 115). While the junction of the spermduct and the prostate is, to all appearances, 
in the glandular part of the prostate (figs. 110 and 113), the real point of entrance is 
in the muscular duct (fig. 118, spd.). After having touched the glandular part, the 
spermducts bend and cross the intervening space to the muscular prostate which they 
enter in a slanting direction, then passing considerably downward enclosed in the 
muscular part of the prostate, before entering the lumen proper (figs. 106, 107, 110, 
111, 112, 115). Fig. 115 represents a cross-section in which the spermducts have 
been cut twice. Part of the spermduct is seen free close to the glandular part of the 
prostate, part again is seen just at the fusion of the ducts with the lumen of the 
muscular part. The duct closest to the lumen has been partly differentiated, the cells 
having lost their nuclei. 
The prostate consists of a very large cylindrical, but greatly coiled, duct (figs. 
106 and 107 and 1), which generally lies pressed flat to the body wall of xviii (fig. 86, 
pr.) It opens outwardly in xviii in the posterior part of the somite in the same pore 
as the penial setze. 
There are two layers of cells in the glandular part, but apparently no muscular 
layer between them. The outermost layer consists of large glandular lobes containing 
glandular cells which pass between the inner cell layer, and discharge in the lumen of 
the prostate (see figs. LO8 and 109). There is a large system of blood vessels which 
penetrate both of the cellular layers, but which is not developed to the same extent as 
in Deltania. 
In cross-section of the body-wall (fig. 103 4) the prostate is seen to open 
laterally to the penial sete, though in the same pore, situated at the very junction of 
the glandular clitellum and the ventral zone (v. p.) of the body (fig. 103 A.¢ ). 
