40 DR. R. F. SCHARFE ON A NEW 
to those of the former. The oviducts (text-fig. 1, ov) lie close 
to the nerve-cords (7.c), one on each side, in which position they 
run from the anterior ovaries backward beyond the genital pore 
and open independently into a wide glandular canal (text-fig. 2, 
gl.c.), as in Fh. terrestris. This canal is characterized by the 
possession of very elongated and ciliated epithelial cells between 
which open numerous glands (g/)—von Graff’s shell-glands. 
During their course the oviducts receive the contents of many 
yolk-glands. Every now and then, in transverse sections, short 
eylindrical ducts conveying food-material for the eggs are noticed 
opening into the oviducts. The latter, it may be mentioned, are 
ciliated. The glandular canal (g/.c.) opens anteriorly mto 
another, the vagina (va), and it is joined there by a duct from a 
large glandular organ—the uterus (wf). 
The numerous testes are arranged in a row on each side of the 
body close to the upper side of the nerve-cords. Two vasa 
deferentia (text-fig. 2, v.d.) convey the spermatozoa towards the 
muscular mass of the penis (p). But before they reach it they 
become dilated to form thin-walled convoluted ducts, which in 
the specimen examined were filled with masses of agglutinated 
spermatozoa (sp). Each of the vasa deferentia opens inde- 
pendently into a sac—the vesicula seminalis (v.s.)—which is 
surrounded by an enormous muscular mass constituting the 
penis (p). A narrow duct (d.p.) leads from the vesicula 
scminalis to the genital atrium, into which also opens the vagina. 
The atrium finally communicates with the exterior (g) by a short 
duct. The vesicula seminalis (v.s.), under a low power of the 
microscope, appears to be coated internally with a thick glandular 
epithelinm projecting far into the lumen of the organ. But a 
high power reveals the fact that the epithelium is thrown into 
short folds which are closely invested by a thick granular mass. 
Whether the latter is secreted by the epithelium or by glands 
lying on the exterior of the muscular penis, I was unable to 
ascertain. 
In the closely allied Rh. Scharffi (2. fig. 53, p. 203), the penis 
lies freely in the surrounding tissue, and is probably eversible to 
1 considerable extent, while in that of the present species the 
movements would seem to be much more limited. 
This concludes my observations on the general structure of 
Rh. Howesi; and it still remains for me to make a few remarks 
