10 FRANCIS H. WELCH. 
quently all are much upon the same plane. Occasionally 
they come into close contact with the distended ovarian 
glands and from the compression they then undergo they 
become crescentic in outline, forming a cap, as it were, to the 
female structure ; there is, however, no commingling of tissue, 
each has its own capsule besides the fibrous sheath. The 
gland substance within the tubal covering is divided into 
component masses (fig. 8, ¢) made up of closely aggregated 
nuclear particles, ;;4;, 1m. in size, resembling somewhat 
human lymphatic gland elements, and on isolation these 
nuclear particles are apparently seen to have a filamentous 
appendage about ~,5, 1n. long, tailed spermatozoa (fig. 9, 6). 
I say apparently, for this reason, that when the gland is 
ruptured up to set free the particles, the encapsulating duct 
is equally torn and its delicate fibre-cells are separated and 
commingled with the gland elements, so that when observing 
these minute structures it is far from easy to say whether the 
extremely fine threads belong to the muscular fibre-cell or 
are filamentous processes from the sperm particle; I infer, 
however, the latter. It seems apparent also that the compo- 
nent masses of the gland are cell forms distended out with 
the fecundating principle. 
Hence from these details we can trace an uninterrupted 
continuity between the sperm-producing mass and_ the 
intromittent organ, nor can any communication be observed 
between the male and female systems; present in each seg- 
ment they are distinct. 
Female Generative System.—The exact relation of the 
external orifice of the vagina to the penis varies with the 
retraction or otherwise of the male organ. Should the penis 
be completely withdrawn the oval-shaped vaginal orifice lies 
just within the fold of the prepuce underneath the tip of the 
organ ; should partial protrusion be present, its direction is 
into the genital pit at right angles to the cuticle (fig. 2, h; 
fig. 7, m); should the evolution of the male organ be com- 
plete, then the female aperture would be situated at its base. 
The vagina, although opening below the penis (fig. 10, 4), 
yet in its course inwards soon becomes parallel to it, but on 
a lower level; it crosses the longitudinal water-vascular 
canal with the male tube, pursuing a slightly wavy line 
through the middle of the visceral space, and crossed and 
recrossed by the coils of the spermatic canal; when nearing 
the centre of the segment it approaches the fibrous boundary 
and likewise curves downwards, and ultimately making a 
sudden bend on itself it joins the uterine cavity near to the 
junction of the middle with the lower third of the segment 
