\ 
348 THE CHICAGO ACADEMY OF SCIENCES. 
b: “Shell: bis Of tricarinate.. wisi ngs re eee ee anlar eS 
Lo” Spirepdepressea. oo. 5 sen suai ee enone ee eee Saianihaly Sines bicarinata 
2. opine elevated’: i. < ceawete stakes aiGtt tame acewe anit ts tricarinata 
143. Valvata sincera Say, pl. xxx, fig. 31; pl. xxxii, fig. 15. 
Valvata sincera SAY, Long’s Expedition, p. 264, pl. xv, fig. 11, 1824. 
Valvata depressa, KUSTER (pars) in CHEMN., ed. 2, p. 88, 1852. 
Valvata striata LEWIS, Proc. Phil. Acad., p. 260, 1856. 
Valvata lewisti CURRIER (descr. ?) 
Shell; Depressed, more or less discoidal, rather solid; 
color brownish, transparent to opaque; surface shining, lines 
of growth numerous, regular, crowded, sometimes encircled 
by a few spiral lines; apex large, round, almost concealed in 
the succeeding whorls; spire very flat, almost discoidal; whorls 
three and one-half, rounded, rapidly increasing, the last consid- 
erably deflected; sutures impressed; aperture round, continu- 
ous, whitish or brownish inside; peristome rather thick, simple, 
pas 
Fie. 131 
_ Radula of VALVATA SINCERA Say. (Original.) C, central tooth; 1, 
intermediate tooth; 2, 3, lateral teeth. 
3 
continuous, the columellar portion being simply appressed 
against the body-whorl; base rounded, umbilicus round, deep, 
exhibiting all the volutions. 
Length, 2.50; width, 4.50; aperture length, 1.60; width, 1.75 mill. (10496.) 
ss Dimon , EOS RY “ 74 1 genet pis i U0 Bali (12141.) 
a DFO Si, OD: bi “ ri aa At ig (12141.) 
Animal: With short, wide foot, bifurcated before and 
rounded behind; head large; rostrum of good size, with a 
black line extending down the center of the upper surface; 
color yellowish-white, transparent; branchia plumose, trans- 
lucent; eyes black, situated at the base of the tentacles; tenta- 
cles long and tapering, terminating obtusely. The branchial 
filament is yellowish-white in color, and is protected by a re- 
spiratory lobe; the branchial cavity is brownish or blackish. 
Kadula formula: 44+-3--y=t=5 +3 +3 3—1=3); (Mus. No. 
12772); central tooth wider than high, concave on the base 
and with somewhat attenuated ends; reflection fifteen-cuspid, 
