7 gE ne Ret ORL DA ee a 
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332 THE CHICAGO ACADEMY OF SCIENCES. 
the center; operculigerous lobe oval, broader than the foot; 
operculum horny, thin, subspiral, striated spirally and longi- 
tudinally, except on the older part which is striate spirally 
( Fig. 118, 1); rostrum short, broad, emarginate in the middle; 
tentacles long and slender, cylindrical, blunt; eyes placed at 
the inner base of the tentacles, in front of a prominent tuber- 
cle; mantle simple on the edge; verge placed on the right side 
of the back, behind the right tentacle, bifid, one part being — 
short, thick and truncated at the extremity, and the other long, 
aa 
Bir 
i A 
3 
Fie; 118. 
AMNICOLA LIMOSA Say. (Il, Binney, Fig. 159; 2, 38, Stimpson, Fig. 7.) 
1, operculum; 2, 8, egg-capsule, dorsal and side views. (Enlarged.) 
pointed, and partly coiled about the first, generative organ in 
the female generally found “at the junction of the body with 
the mantle, a short distance within the margin of the latter’* 
( Fig. 119). / 
“The ova are deposited, in this latitude, during the months 
of Apriland May. The ova-capsule is thin, corneous, of a 
semilenticular shape, and attached by the cut face of the lens, 
which formsthe base. The free limb is margined witha broad, 
: A 
Fic. 119, 
Animal of AMNICOLA LIMOSA Say. Enlarged. (Stimpson, Figs. 1 
and 2.) 1, dorsal view; 2, ventral view. 
thin lamina of the same delicate, horny texture as the envel- 
ope of the capsule itself. In size these ova-capsules are a 
little larger than the head of the animal. They are deposited 
singly and each contains but a single egg, which floats freely 
*The writer must acknowledge his indebtedness to the splendid work of Dr. William 
Stimpson (Researches upon the Hydrobiinz, etc.), from whose pages much information has 
been gleaned. (See pp. 13-16). 
