ev le ee 
rar ( 
in 
THE NATURAL HISTORY SURVEY. 331 
Animal: With a short, broad foot which is broadly 
rounded behind; rostrum short; tentacles cylindrical, blunt at 
their tips; verge short, bifid, with a globular base; jaw present; 
lingual dentition of A. porata; rhachidian tooth very short and 
broad, with a tongue-shaped process from the middle of the 
anterior surface, reaching beyond the base; intermediate tooth 
with a short, broad body having a strongly projecting infero- 
interior angle, and a very long peduncle; formula of denticles: 
rhachidian, 72,; intermediate, five; first lateral eighteen; sec- 
ond lateral thirty. (Stimpson.)* 
“Ova-capsules semilenticular in form, with a lamniform 
limb. Each contains but one egg.” (Stimpson.)* 
Distribution: North America. 
KEY TO SPECIES OF AMNICOLA. 
A. Shell 5 mill. or over in length, whorls swollen, spire some- 
WineSlomo ated). Weer Ae sere a et. ect ec wee rd ra, cincinnatiensts 
B. Shell 4 mill. or less in length. 
a. Shell swollen, diameter and length about equal............. limosa 
b. Shell narrow, diameter about half of length. 
PO pite OtusSe, WHOIS FOIE ft. Mi ct oa yack eels wie emarginata 
SOMITE DOME ewHOTiS AVE «sesso ide Gass Shee sage ote hee lustrica 
134- Amnicola limosa Say, pl. xxx, fig. 35. 
Paludina limosa Say, Journ. Phil. Acad., Vol. I, p. 125, 1817. 
Amnicola schrokingeri FRAUENFELD, Pric. Zoé]. Bot. Gesell, Vienna. 
Amnicola ferruginea CALKINS, Valley Naturalist, Vol. II, No. I, p. 6, 
1880. 
_ Shell: Conic, bulbous, subimperforate, nearly as broad as 
high; color light or dark brown, without bands of color; sur- 
face shining (except when covered by deposit of foreign mat- 
ter, as is frequently the case), lines of growth numerous, fine, 
wrinkled, crowded; sutures well impressed; whorls four to five, 
more or less inflated, regularly increasing; spire obtusely conic, 
swollen; aperture orbicularly ovate, rounded above and below, 
dark horn-color within; peristome sharp, simple, a little thick- 
ened on the inside, almost continuous; columella lip covered 
with a thin callus; base of shell rounded, subumbilicate. 
Lengtb, 5.00; width, 3.25; aperture length, 2.10; width, 1.50 mill. (10498.) 
ie BOO asc *s 4.00; k & 2.60r ey ALO" 
x: D00 Here 54.005 a “ A002 ie. 2.10 ‘ (18052.) 
Animal; White and transparent, brownish on the head; 
foot short, rather wide, about two and one-half times as long as 
broad, auriculated before, rounded behind and constricted in 
*Binney, I. c., p. 80-81. 
