70 
ZOOLOGICAL EXERCISES. 
will be seen taking a zig-zag course from the spiral 
part of the animal to the albumen gland. This is 
the hermaphrodite duct. Rupture the integument 
of the posterior part of the animal, and with a brush 
wash away as much as possible of the liver. A large 
botryoidal organ will be left—the ovo-testis. Snip 
off a portion with the scissors and examine with the 
quarter objective in a drop of salt water. Probably 
it will be found to contain both ova and spermatozoa. 
Trace the duct from the ovo-testis to the albumen 
gland. Cut off a portion and examine. It will be 
seen to be ciliated internally, and will probably con- 
tain spermatozoa. These are thread-like, with one 
extremity slightly thickened and spirally twisted. 
Now turn the animal over so that the dorsal side is 
uppermost, and open the pulmonary chamber as 
before directed. Remove carefully, piece by piece, 
the coiled intestine. Running parallel with the 
rectum, and lying over it will be seen the more or 
less inflated anterior portion of the uterus, and lying 
internally to this is the yellow vas deferens. Raise 
the albumen gland and cut the hermaphrodite duct. 
The albumen gland will be found to consist of two 
portions, the lower part being yellow, and composed 
of coiled tubules. This is the posterior portion of 
the uterus. Dissect out the vas deferens. On ap- 
proaching the anus it will be found to turn suddenly 
forward and to enter the base of the penis. Near 
where it enters two other glands will be found, also 
entering the penis; one of these is bright yellow, the 
other white. The yellow gland can be unravelled, 
and is found to consist of a long simple tube. The 
white gland is composed of coiled tubes, which can- 
