138 TYE NAUTILUS. 
Physa integra Hald. Ohio R., Coravpolis, 1; Beaver, 6, 
Family LIMN 2ID&. 
Limnaea columella Say. Shenley Park, Pittsburgh, 20; Ohio 
R., Beaver, |. 
Planorbis trivolvis Say. Ohio R., Coraopolis, 15. 
‘ Planorbis bicarinatus Say. Ohio R., Coraopolis, 20. 
Family ANCYLID&. 
Ancylus diaphanus Hald. Near mouth of Raccoon Creek, 20; 
Allegheny R., 6 m. Isl., Pittsburgh, 50. 
Ancylus rivularis Say. Beaver R., Wampum, 6; Raccoon Creek, 
Beaver Co., 3. 
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A NEW FTERONOTUS FROM CALIFORNIA. 
BY W. H. DALL.” 
Pteronotus Carpenteri, n. sp. 
Shell trialate, reddish brown, with obscure spiral lines of darker 
brown, the aperture whitish with a darker throat; nucleus brownish, 
whorls about eight, the last much the largest; suture distinet, ap- 
pressed, intervarical surface smooth or obscurely spirally striate, the 
apical whorls with reticulate threading ; the last two or three whorls 
with a single obscure nodulosity on the periphery between the var- 
ices; varices continuous up the spire; posterior face of the varices 
smooth with obscure radial ridges which slightly crenulate the margin, 
in adolescent shells; but in full grown ones there are zbout five rather 
wide, low radial ridges, each of which terminates in a digitation of the 
margin; anterior face of the varices with profuse, close-set crenulate 
imbrications, which in fully grown shells show radial depressions cor- 
responding to the ridges on the back of the varix; digitations exca- 
vated in a shallow manner anteriorly, terminating in somewhat blunt 
projections, thin and sharp edged; aperture small, oval, with a con- 
tinuous, raised, smooth margin without denticulations; canal closed, 
moderately wide, bent to the right in front, a disused smaller canal 
bordering its posterior two-thirds on the jeft. Length of shell 57, 
of last whorl from the suture, 42; width including varices, 55; width 
of aperture, 9.5; length of aperture, 13 mm. 
Monterey, Cala., F. L. Button ; at station 2908, off Pt Conception, 
Cala., in 31 fms., sand, U. S. Fish Com.; and at the Farralone islands, 
Cala., J.S. Arnheim. This shell recalls P. macropterus Desh.. of the 
Antilles, and like it belongs to che section Pteropurpura Jouss. Young 
specimens are more pointed, and with narrower, less digitate varices, 
