312 Proceedings of the Royal Society of Edinburgh. [Sess. 
XXXII. — A Specimen of Helix pomatia with Paired Male Organs. 
By J. H. Ashworth, D .Sc., Lecturer in Invertebrate Zoology in 
the University of Edinburgh. Communicated by Professor J. C. 
Ewart, M.D., F.R.S. (With Plate, and Two Figures in the Text.) 
(MS. received May 10, 1907. Read June 3, 1907.) 
The specimen of Helix pomatia which forms the subject of this communica- 
tion was found among the class material * in the Zoological Department of 
the University of Edinburgh. It presents so unique and interesting an 
abnormality that it is worthy of description in some detail. 
The animal was approximately full-grown and possessed a normal 
dextral shell. On dissection it was observed that, in addition to the usual 
set of reproductive organs present on the right side, there were, on the left 
side, certain other structures undoubtedly homologous with the normal 
accessory male organs. The roof of the mantle chamber was removed,*)* 
the body wall cut through by means of an incision in the mid-dorsal line, 
the flaps pinned out, the alimentary canal and the reproductive organs 
carefully uncoiled, and the latter laid out to the right side of the animal. 
The alimentary canal presented no unusual features, and it has been 
entirely removed. The remaining structures are shown in fig. 2. 
The normal reproductive apparatus may be first briefly described. The 
ovotestis (O.T.) or hermaphrodite gland, j which was embedded in the liver, 
has been dissected out so as to show its ducts which lead into the sinuous 
hermaphrodite duct (H.D.). This opens into the common duct, but just 
before doing so it bears two small closely apposed blind diverticula, about 
3 mm. long — the vesiculm seminales — only one of which (Y.S.) is shown in 
the figure ; the other, which is slightly smaller, lies hidden beneath. At 
the point of junction of the hermaphrodite and common ducts there is a 
large, somewhat tongue-shaped, albumen gland (Alb.G.).§ 
The common duct is imperfectly divided by two internal longitudinal 
* Collected in the neighbourhood of Wiirzburg. 
t The heart, the pulmonary vessels, and the nephridium were quite normal. 
X The ovotestis was removed and sectioned, and though the histological details were 
defective it was obviously quite normal in structure. Various stages in development of 
spermatozoa and ova were seen, including ripe spermatozoa and a considerable number of 
large oocytes *11 mm. in diameter. 
§ This is shown in the figure, as it was pinned out, in an extended form ; in its natural 
condition, as it lies in position in the animal, it is much more curved. 
