TRANSACTIONS. 
On the Anatomy of the Generative Organs in certain 
PuLMOGASTEROPODA. By Alfred Sanders, M.R.C.S., 
F.L.S., &c. 
(Read June 14, 1865.) 
The phenomenon of dicliogamism displayed by the Puhno- 
gasteropoda and their allies has engaged the attention of 
anatomists since their science has been cultivated. The subject 
is old, but I think its interest is even now by no means ex- 
hausted. The physiological import of the different glands 
which make up the complicated dichogamic apparatus of 
these animals has received various and contradictory inter- 
pretations. It was the gland situated in relation to the last 
lobe of the liver v/hich was the subject of greatest dispute 
among the earlier writers ; one party, observing only the ova, 
and neglecting or misinterpreting the zoosperms^ maintained 
its ovarian character; others, denying the existence of 
the former and paying attention only to the latter, were 
equally strenuous in maintaining its testicular character. 
These authors, thus committed to a one-sided view of the 
functions of this gland, were thrown on their resources to find 
another which would answer the purpose of a testis or ovary, 
as the case might be. 
Although Swammerdam,"^ in describing the anatomy of 
one species of snail, calls the gland in question the ovary, 
in another species he assigns that character to the albu- 
rn eniparous gland, while in both he • sought the testis in 
the multifid vesicles. Cuvier f also described this gland as 
the ovary, and referred to the albumeniparous gland and 
prostate as together forming the testis. G. R. Treviranus,J 
on the contrary, held just the ojjposite opinion, considering 
the former to be the testis, and the albumeniparous gland to 
* 'Buch der Nalur,' irans. by Thomas Filoyd, 1758. 
f ' Annales du Museum/ vol. vii, 1806, 
:|: ' Tiedcmaiiu und Treviranus' Zeit. fiir Pliysiologie/ i, 1821. 
VOL. XIII. i 
