1876.] Zoölogy. 74T 
? Limnea lepida Gld. Some young specimens, probably referable to : 
this species. 
Limnophysa desidiosa Say. Several specimens; not uncom 
that region. i 
Limnophysa humilis Say. Some examples of this shell, which is prob- 
ably numerous throughout the Territories. 
? Physa inflata Lea. Dr. James Lewis, who examined the fluviatiles 
of this collection, queries this identification, but admits that the type 
extends from Virginia to Colorado. Mr. Binney regards it as a syn- 
ha of P. heterostropha. There seem to be two specimens, of different 
Physa heterostropha Say. Many specimens 
near New York shells as well can be. It is har 
: Anakon here. Some of the specimens are thickly coated with rust 
d the iron-waters in which they have lived, and others with a white 
deposition accumulated from the water. They occur in great abundance 
everywhere among the mountains. 
There is a Bulinus which looks as if it might be a variety of B. 
hypnorum, but is scarcely identifiable with that species. 
a oon bis (Helisoma) plexata Ing. Three examples of this species, 
a escribed from my specimens, are among this lot, the largest and 
est one showing the twisted appearance very y. 
Planorbis bicarinatus Say. This well-known shell is now first re- 
ported from Colorado, but has been found on the Yellowstone. These 
examples are of average size. The common P. trivolvis is not included 
in this collection. 
_— parvus Say. Quantities of this shell, 
mon in 
pee ns KEAREN 
bP, oy a ma yao (eR aS 
of various sizes, but as 
d to draw the boundary 
a Ne SD E bere: ee AS Ree? Claas eet 
plain! 
eee, eet S a NN ees eel 
Tes eet eae maga i Be og 
very common in Col- 
diminutive Ancylus which it is 
sembles A. diaphana. 
haracteristic examples. 
i imperfect specimens represent a 
Go t to name, but which somewhat re 
ontobasis pulchella Anth. Several € 
Goniobasis livescens Menke. A number of specimens: 
agape There is a single W ed example of an 
ea to which Dr. Lewis says he know 
rown ones (not named) from California. I 
a eg smooth without, somewhat decort ep 
sta s, and lustrous blue within, changing 208 gos 
a al much smaller ones of similar shape; but lighter-color “a 
ipa may be the young of the former. J Dr. Lewis sugges 
ku ould prove to be an undescribed species, it OU; 
~tileated to the energetic naturalist i e and care We- 
f Colorado mollusks. 
e condition, of 
are i . . b 
indebted for this interesting collection O 
Two specimens 
opaa size, but varying somewhat from the w 
an itidium abditum Hald. A largo quantity of these shel 
_ Yastly abundant in places all through the West. — ERNEST INGERSOLL. 
