258 THE CHICAGO ACADEMY OF SCIENCES. 
penis. The penis and penis sac are retracted by a set of pow- 
erful muscles (RM, PSM, VD). A nerve starts from the cerebral 
ganglion (CG) and after extending for a short distance divides, 
one branch running to the head of the penis and the other 
entering the penis sac(PN, PSN). The penis is generally yel- 
lowish in color, sometimes very bright, while the penis sac is 
grayish (in alcohol) or yellowish (living). The muscles are 
white in color. 
The vas deferens is long and hairlike (F), and extends from 
the head of the penis to the base of the penis sac where it be- 
comes lost in the muscular tissue; it reappears at the opening 
of the vagina where it becomes the duct of the prostate (PD); 
this duct is rather long, very narrow and enlarges on the side 
of the vagina into the prostate gland (PR), a cylindrical, fleshy 
organ, well supplied with blood vessels and of a yellowish or 
amber color. Posterior to the cylindrical portion, the prostate 
becomes very much narrowed and flattened, whitish in color, 
and near the albuminiporous gland it again enlarges into a 
much folded organ of a grayish color. From this point the 
hermaphrodite duct passes to the hermaphrodite gland. 
Female organs: (Pl. xxxiii, Fig. D): The hermaphrodite 
gland or ovotestis is made up of a number of rounded or lobu- 
lated follicles, which are yellowish in color. The oviduct (or 
hermaphrodite duct (OD) extends from the lower part of the 
ovotestis to the albuminiparous gland, from which it divides, 
one part forming the prostate and the other the uterus. The 
albuminiparous gland (AL) is large and rounded and of a green- 
ish color. The uterus (U) is at first trilobed, then becomes 
smaller and rounded, then swells into a large, fleshy, cylin- 
drical sack, the vagina (V), then contracts to form the vesti- 
bule or atrium (A) and finds its exit behind the male orifice and 
near the respiratory orifice. The uterus and vagina are yel- 
lowish in color. The walls of these organs are made up of 
strong muscular tissue. The spermatheca or receptaculum 
seminis (S) is elongate-ovalin form, of a pearly white color, and 
connected with the vagina by a long, narrow duct (SD) which 
enters the latter near the cylindrical portion of the prostate, 
just above the atrium. The vagina is supplied with two stout 
retractor muscles (VM). In the natural position the ovotestis 
is folded in the lobes of the liver and is very strongly attached 
to that organ.* 
*For an extended account of the anatomy of Limnza see the writer’s paper, Bull. Chi. 
Acad. Sci., Vol. II, No. 3, from which the above description was mainly drawn. 
Be 9 oa 
