1912. | E. Guosu: The Anatomy of a Slug. Ig 
Comparing the alimentary canal of these slugs with that of the 
more typical groups of pulmonates, c.g. the land snails, it should be 
observed that in the present animal there is no distinct dilatation 
of the midgut in the form of stomach quite distinct from the liver, 
which opens into the gut by small ducts in contradistinction to 
the separate stomach and liver in the land snails, Here the 
stomach might be considered to have become incorporated with the 
cavity of the gland, the wall of which presents numerous tubular 
glands homologous with a separate digestive gland. 
VI. REPRODUCTIVE SYSTEM. 
As in other pulmonates, the male and female genital organs 
are united in the same individual. There is some difference in 
opinion about the connection between the male and female organs 
at their proximal ends, Simroth’s (10) descriptions and figures of 
the genital organs of his three species show that there is a com- 
mon hermaphrodite gland from which are given off the vas defer- 
ens and oviduct; this condition then corresponds to the second of 
three types of genital ducts described by Lang (8). Collinge (3, 4), 
however, could not find out any connection between the two in 
his specimens. Although I found the two organs separate from 
each other, Ihave a good deal of doubt about the validity of 
Collinge’s view for the reasons noted below. On examining under 
the microscope the stained sections of the organ which corres- 
ponds to what Collinge described as ovary, I observed sper- 
matozoa in different stages of development to my full satisfaction 
in addition to immature ova. As I had only old spirit specimens 
to dissect, it occurs to me that the so-called ovary is really a 
hermaphrodite gland the fine vas deferens of which I could not 
trace. As the hermaphrodite and albumen glands lie over the 
penial sheath it seems to me that the vas deferens, being very 
fine and small, gets torn as the above glands are lifted up from 
their position and are separated from the penial sheath. Still 
as I could find out no connection between the two organs in the 
several specimens I dissected, I leave the question for further 
consideration in future. 
(I) MALE GENITAL ORGANS (pl. xxvi, fig. 20). 
(1) A fine thread-like tube (pl. xxvi, fig. 20a) opening into the 
posterior end of the penial sheath near the attachment of the 
retractor muscle of the penis. It lies along the left side of the 
penial sheath and the stout tube in front, and extends to near 
the external opening of the right Simrothian gland. The same 
arrangement is seen in both A. maximus and A. sarasimt described 
by Collinge (4) who called the tube vas deferens. Considering 
the anatomy of the genital organs of other pulmonates, this 
tube seems to be homologous with the flagellum. This has 
