672 THE AMERICAN NATURALIST. Vor. XXXIX. 
diameter; the uterus is somewhat egg-shaped and very large ; 
folded. 
ored 

uterus, a 
oviduct large and much 
Receptaculum 
seminis globular, small, 
its duct very fine, in- 
serted near the opening 
of the vagina. 
miniparous gland large. 
The organs are col- 
ored as follows : oviduct 
orange, male genitalia 
blackish white, the rest 
of the organs flesh-col- 
Albu- 
The genitalia of emar- 
ginata differ from those 
of palustris in having 
a more bulbous-shaped 
smaller re- 
ceptaculum seminis and 
a more cylindrical pros- 
Fic. 7.— Genitalia of Lymncea emarginata, the organs sepa- tate, which terminates in 
rated to show their relations to each other. Note the divi- 
sion of the ovi d £ h 14 3 

osta 
largement 
like those of palustris. 
Lymnea desidiosa Say. (Fig. 8.) 
Male Organs.— Similar to those of emarginata. 
The prostate is whitish and is irregularly fusi- 
form, tapering at both extremities. Muscles and 
their insertions as in emarginata and reffexa. 
Female Organs.— The vagina is very short and 
the uterus is large and long and pyriform in 
shape. The receptaculum seminis is globular in 
form and large 
emarginata. 
a somewhat bulbous en- 
resembling 
that of stagnalis. The muscles of the penis and penis-sac are 
of 
di 

r ın proportion than that of me & — foun 
Lymnea desi- 
ae 
