TRANSACTIONS OF MICROSCOPICAL SOCIETY. 
DESCRIPTION OF PLATE VII, 
Illustrating Mr. Sanders^ paper on the Anatomy of the 
Generative Organs in certain Pulmogasteropoda. 
1. — Generative" organs of Planorbis corneus, natural size. 
a. Dicliogamic gland. 
, b. Its enlarged duet. 
c. Albumeniparous gland. 
d. Oviduct, its enlarged portion. 
e. Spennatheca. 
/. Vagina. 
g. Prostate gland. ' 
h, h. Vas deferens. 
L Penis. 
2. — Generative organs of L'mnceus stagnalis, natural size. 
a. Dicliogamic gland. 
b. Its duct. 
c. Albumeniparous gland. 
d. Oviduct.. 
e. Spermatheca. 
f. Vagina. 
g. Vas deferens ; letter placed at its enlargement. 
h. Penis and its retractor muscle; letter placed on the muscle. 
3. — Generative organs of Helix aspersa, natural size. 
a. Dicliogamic gland imbedded in lobe of liver. 
b. Its duct. 
c. Albumeniparous gland. 
d. Plagellum. 
e. Oviduct and prostate j letter placed close to prostate. 
f. Vas deferens. 
g. Penis, 
h. /?. Multifid vesicles. 
i. Retractor muscle of penis. 
k. Piece of integument marking external opening of vestibule. 
I. Vestibule. 
m. Dart-sac. 
n. Vagina. 
0. Spermatheca. 
p. Its diverticulum. 
Flanorbus corneus. 
^a.—k group of youngest sperm-cells from the dichogamic gland of P. 
corneus, each cell measuring about '0003". 
