OF NORTH AMERICA. 221 



Binney's figure 96 seems to belong to cockerelli rather than to 

 bulimoidcs. 



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 tcchella; whorls 5-5^2, 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 

 trect, 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 3.00 " 



7.50 4.50 4.50 2.50 " 



8.50 5.25 5.00 3.00 " 



TYPES : Chicago Academy of Sciences, seven specimens, No. 

 23948. 



TYPE LOCALITY: Rose Canyon, near Pacific Grove, San Diego, 

 County, California. 



ANIMAL, JAW, RADULA 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. 



ECOLOGY : "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 tcchella, 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, whichj. in many cases, produces a continuous 

 aperture. 



