SPECIAL ANATOMY. 231 
rived from a granular, glandular organ combined with 
the testicle in the posterior lobe of the liver. 
Succinea. The testicle is not separated into distinct 
fasciculi by the parenchyma of the liver as in Helix, but 
forms a single mass. The epididymis is very much con- 
voluted, and appears always to be distended with sperm- 
atic matter. The prostate gland is unusually short, 
occupying the upper half only of the length of the ovi- 
duct, and is thick, clavate, and more or less colored by 
pigmentum nigrum cells upon the surface. The penis 
is long, cylindroid, curved downward at its upper part, 
and is joined at its summit by the vas deferens. The 
retractor muscle is inserted into the penis a short dis- 
tance below its summit. The genital bladder is large 
and globular ; its duct is neai-ly as long as the oviduct, 
and is narrow. The vagina is moderately long and mus- 
cular. The cloaca is short. 
Glandixa. The testicle is an oval mass, separated 
from the liver as in the Limaces. The epididymis ap- 
pears from a hilum in the side of the testicle ; at first 
but slightly tortuous, it becomes convoluted just before 
ending. Its accessory glandula is large. The penis is 
long, large, and clavate, very gradually enlarging from 
the base to the summit. The vas deferens, which joins 
the latter point, is long, moderately tortuous, and wide. 
The retractor muscle is inserted into it near its ter- 
mination in the penis. The bladder is oval, constricted ; 
