wo 
ous, its plane oblique to the axis of the 
shel!, the base of the lip being advanced 
‘olor ecorneous, often 
black ee eous deposit. 
diame ie er 
ne: attaks river, Washington (Hen- 
ry Herska 
Pilsbry, Nauti ilus 4: 62-64, 
heastern 
aca mountains 
east of San ek California (Orcutt), 
CARINIFEX NEWBBERRYI Lea 
est Coast gee ao f 104, 
Keen, ee 
Shel! light horn co lo rreted, very 
inctay Striated, ah rene elow 
acutely carinated, oadly and deeply 
umbilicated, whorls. 5, flat above, slop- 
ing convex below; aperture large, sub- 
triangula 
Livi Klamath = lakes Oregon, to 
Owens river and Clear ioe. California, 
Nevada. Utah. 
Pec eIOPA ROWELLIIT Tr ryon. 
depressed, Wider oa n_ high, 
whorls 314, regularly c conv pidly en- 
ing; spire small, slightly elevated, 
cute, sutures, well arked; bas 
i ing i) 
cus. Color yellowish-creen, 
Passe eight 214 
‘Clot lake, Sabeachis ? 
FLU: MINICOLA FUSCA Hal Spoon 
epiobose, Par candy » Whorls 5, 
Pan- 
Ng, sutures very q, 1 apidiy a 
; ; ¥Y deeply iepeinek 
aper ure i shteo br gmacg Migrant columella 
ene Co} r ‘0 light sreenish, 
he 
Rh 
amento 
af cial 
tak 
Cal 
Fer Bt river, Oregon. > oh gt 
Dak ~ 
PLUMINICOL, oo DSI Baird, 
Ke ine Wes ast shells, 63 
+ Livi 2 ee ie river, Monta 
PLUM NICo OLA NU Ei 
nate, thick, whorls 
fapex fFeneraliy "erode ed) conve 
fures well j pressed: ay *rture gi Poin 
widely ovate Greenish, apertnire blue 
St Height 16 diameter 8.9 ™m. 
alving: British Columb! 
tek Cane: imbia: Sacramento 
FLUMINICOLA \ TIRENS Lea. 
n, rest Coast ee 
‘nick, apex eroded, who 
. on ee convex: aperture rey 
Bright sreen, bluish wit thin. 
The West American Scientist. 
36 
Height 10, diameter 6 
oe Oregon and Horton Califor- 
ish dbleom meg CALIFORNICA Rowel 
Aperture suboval, obliquely expanded 
Cee aia left, poser iorly rounded, 
wider terior:y. nteérnal shelf réaé on 
in ng for ae about one- =atth the length of 
the tyes its > 
and obl.a 
fon - 2 e left projects nearly as far 
back he ap an obtuse angle. 
Structrre corneous, with is) 
é rown, opaque; inner 
Surface shining and purpl’sh, the plate 
hite towards th dge nd i ome 
specimens showing a t ckened, white 
semicircle continuous with its merzin 
across arch of the re Length 4 
width 2, altitude 1.5 a 
ing: ns 
stagnant pondg, California. often 
on the ba f another. 
more back of 
IMNAEA ADELINAB Tr n. 
She thin, semi-transparent, body 
whorl large. wide, nvex; spire small, 
consisting of 5 convex volutions, attenu- 
ting rapidly to an acute pex, sutures 
impressed; inner lip thin, reflected, but 
f covering tha v ilical fissure, which 
Ww 
horn, polished within the aperture, sh 
a“ red within. Length 14, 
ies rg Picinaen, San Diego (Or- 
cutty, California. Tijuana, Baja Cali- 
fornia (Oreutt). 
LIMNABA BULIMOIDES Lea 
Pate? Sik Upper Missouri river to Coa- 
mbiz, river. San Di lego, California, 
LIMNADA CAPERATA SAY. 
Livin New York; fpr pine ds 
Michigan: to Hudson bay, and northe 
California. 
oe. EMARGINATA 
when present: 
te the length of s 
as to form an umbilic 
elle, obsolete; colume llar hecveuan deep- 
ly pimatginate, Cc chr race ous 
Maine; Lake Winnipeg: Wash- 
Hicted 
LIMNAFA HUMILIS Say 
Living: Throughout ine United States. 
tae California (Oreutt),. Vancouver 
is 
LIMNAEA LEPIDA Gould. 
Living: Columbia river, to Antioch, 
California 
LI IMNARA PALUSTRIS Mueller. 
Living: Teepe: Mountain meas 
California; New Mex 
tg rea STAGNALI Is Ex 
Living: Europe; Siberia; Ohio to Or- 
egon® Cal fornia. 
