94 Sanders^ on the Anatomy of the Generative 
from which two triangular projections run down to the 
orifice, which is situated on the right side of the animal, and 
opens just behind the right tentacle. 
Eig. 3. — In Helix aspersa the dichogamic gland consists of 
elongated cseca, like P. corneus, and is imbedded in the liver, 
like L, stagnalis. The caeca are arranged, two or three 
together, on the termination of a branchlet of the duct. The 
contents are arranged precisely as in the former species, the 
ova occupying the csecal extremities, and the sperm- cells and 
immature zoosperms occupying the remainder of each csecum. 
The course of development of the zoosperms is precisely 
similar in this as in the other two species, and could be de- 
scribed in the very same words. 
The branchlets from the different groups of cseca having 
united together and formed a common duct, the latter leaves 
the gland, and becomes convoluted in regular folds. After a 
short course it reaches the albumeniparous gland, where it 
undergoes a reflexion of its course backwards in the sub- 
stance of that gland ; then it turns forwards again, and opens 
by a small orifice into the commencement of the oviduct. H. 
Meckel ^' describes a second duct, which he supposes is the 
oviduct, but which Semperf suggests is a nerve. The latter 
is correct, for not only is the quasi duct like the large nerves 
in structure, but it can be traced to a branch of the sub- 
oesophageal ganglion, which accompanies the oviduct on its 
inner side as far as its junction with the albumeniparous 
gland, and there divides into two branches — one, crossing be- 
neath the oviduct and spermatheca, goes to supply the liver 
and gland of viscosity; the other accompanies the duct of 
the dichogamic gland, on which it is distributed. 
The albumeniparous gland is a large sickle-shaped gland, 
having externally an obscurely lobulated appearance; it is 
situated on the right side, with its concavity embracing the 
enlargement of the gullet, and being overlapped slightly on 
its left side by the liver. It consists of large gelatinous 
cells, which pour their contents into a central canal, which 
again empties into the oviduct ; this is a large canal, very 
much puckered, and apparently shortened by the prostate, 
which occupies its inner side ; the vas deferens is a groove 
situated on its floor, being partially separated from it by 
a longitudinal flap, which divides the whole into two half 
canals. 
The prostate is composed of numerous follicles, arranged 
along the whole length of the oviduct, each follicle opening 
into the vas deferens ; it appears to be homologous with the 
* Op. cit. f Op. cit. 
