MUSEUM OF COMPARATIVE ZOOLOGY. 167 



Zonites Shepardi, Hemphill. 



Shell umbilicated, very small, depressed ; whorls 3 or Si, shining, transparent, 

 smooth, somewhat flattened ; spire scarcely elevated above the body whorl ; aper- 

 ture oblique, oval ; peristome simple, acute, its ends hardly approaching ; suture 

 well impressed; umbilicus pervious, and moderately large for so small a shell. 

 Great diameter, 2 mm. Height, 1 mm. 



Santa Catalina Island, California. 

 ■ This little sliell belongs to the planulate forms, and somewhat resembles a minute 

 Z. Whitneyi. 



I dedicate it to Miss Ida Shepard in recognition of her active services among the 

 moUusks of Long Beach, Cal., where she resides. 



The above is Mr. Hemphill's description. 



Zonites Lawae. 



Shell small, umbilicated, globose, flatter below, shining, light horn-colored, 

 marked with coarse wrinkles of growth ; spire rounded ; whorls 8, gradually- 

 increasing, slightly convex, the last excavated below around the umbilicus ; 

 aperture oblique, rounded ; peristome simple, acute, thickened with callus 

 within. Greater diameter 9 mm., lesser 7 mm.; height 4 mm. 



Zonites placentula, part, W. G. Binney, formerly, Terr. Moll. U. S. V., p. 124, Fig. 



44; Plate IIL Fig. L (dentition). 

 Zonites Lawi, W. G. Binney, Suppl. to Vol. V. p. 142; Plate XL Fig. E (also, 



Ann. N. Y. Ac. Sci., Vol. I., Plate XV. Fig. E, as undetermined). 



Mountains of Tennessee (Miss Law) ; a species of the Cumberland Subregion. 



Readily distinguished from placenttda by its larger size, higher rounded spire, 

 greater number of whorls, and more widely excavated umbilical region. 



Jaw as usual in the genus. 



Lingual membrane (Vol. V. Plate III. Fig. L, as placentula) with 25-1-25 

 teeth; three laterals and one transition tooth. 



Zonites Caroliniensis, Cockerell. 



' Plate III. Fig:. 7. 



Among the specimens of Zonites sculptilis collected in the mountains of 

 North Carolina are many which differ from the type widely enough to be 

 considered a distinct species. Mr. Cockerell suggests for it the name Caro- 

 linensis, thus describing it : — 



This species differs from sculptilis in its fewer whorls, straighter columellar 

 margin, less lunate aperture, fewer radiating striae, and other points. It is figured 

 as sculptilis in Manual of American Land Shells, Fig. 231. 



