LYMNAIDA OF NORTH AMERICA. 221 
Binney’s figure 96 seems to belong to cockerelli rather than to 
bulimoides. 
Galba bulimoides cassi Nov. Sp. Plate XXVIII, figures 9-11. 
SHELL: Ovate, elongated, solid; periostracum light yellowish- 
horn; surface shining, growth lines heavy, conspicuous; spiral lines 
absent ; body whorl without malleation ; nuclear whorls similar to those 
of techella; whorls 5-5™%, flatly convex, the body whorl ovate in out- 
line; spire acutely conical, rapidly acuminating; sutures impressed; 
aperture ovate, rounded anteriorly and angled posteriorly, as long as, 
or longer than, the spire; outer lip simple; inner lip reflexed to form 
a flat shelf which is broad with parallel margins and stands almost 
erect, overhanging the umbilical chink which is widely open. 
Length. Breadth. Aperture length. Breadth. 
7.50 4.50 4.00 2.50 mill. Type 
8.50 5.00 4.50 3x0) 4 
7.50 4.50 4.50 Os oe 
8.50 5.25 5.00 10) Ones * 
Types: Chicago Academy of Sciences, seven specimens, No. 
23948. 
Type Locatity: Rose Canyon, near Pacific Grove, San Diego, 
County, California. 
ANIMAL, JAW, RapULA and GENITALIA: Not examined. 
RANGE: Southern California and northern Lower California. 
Cassi occupies the southern portion of the Californian region. Its area 
of distribution will probably be greatly widened by more extensive 
collecting. 
RECORDS. 
UNITED STATES. : 
CALIFORNIA: Rose Canyon, near Pacific Grove, San Diego Co. (C. L. 
Cass). 
MEXICO. 
Lower CALIFORNIA: Near Alamo (Orcutt). 
GEOLOGICAL RANGE: Unknown. 
Ecotocy: “In intermittent stream which runs but two months 
of each year; in summer overflow of drinking tank of cattle” (Cass). 
REMARKS: Cassi may be distinguished from techella, which it 
closely resembles, by its more ovate shell and aperture and by its inner 
lip which stands erect instead of being broadly reflected. In techella 
the inner lip is usually appressed at its junction with the parietal wall, 
while in cassi it is not appressed at this point, but forms a continuous, 
evenly curved projection, which, in many cases, produces a continuous 
aperture. 
