334 PROCEEDINGS OF THE ACADEMY OF [1896. 



This species is closely allied to C. Agasski Dall and C. gtibema- 

 torium Crosse, of the island of New Providence. It has more 

 remote affinity with C. sarcosfomum P. & V. of Little luagua. 



From C. Agassizi it differs in never having the parietal callus 

 raised in a strong ridge making the peristome continuous ; the ril)s 

 are less sharp and narrow, etc. C. guhernatorium has a proportion- 

 ally very large mouth, less thickened lip, finer riblets or none, and 

 a glossy surface ; moreover, while nearly white examples occur, it is 

 generally much variegated. There can be no doubt of the close 

 relationship of the three species, but judging from a series of 25 

 examples of C. Eleutherce, a good series of C guhernatorium and 

 author's examples of C. Agassizi, they are specifically distinct. 



A pair of specimens of C. Eleutherce before us (from Krebs) are 

 considerably streaked with brown, otherwise typical. Another spec- 

 imen, received from Mr. Van Nostrand, is very small, alt. 18i, diam. 

 8 mm., and somewhat maculated. The costulation extends further 

 up, and the peristome is not thickened. This probably represents a 

 subspecies. 

 Cerion Blandi Pilsbry &, Vanatta. PI. XI, fig. 7. 



Shell solid and strong, cylindric-tapering, the latter 3 whorls ap- 

 proaching equality in diameter, those above slowly tapering to form 

 a long cone, gradually passing into cylindrical portion. Light 

 grayish, with inconspicuous white flecking. Whorls 10, the nepionic 

 2? corneous, smooth, the following 2* weakly, distinctly ribbed, later 

 4J to 5 whorls very sharply and roughly, strongly ribbed, ribs narrow 

 and high, 19 to 22 on each of the two or three later whorls. Um- 

 bilicus compressed, rimate, the area behind columellar lip excavated> 

 smooth. 



Aperture ovate, white within ; peristome reflexed and recurved, 

 not thickened ; parietal callus heavy, forming a strong bar across 

 the space between lip ends. Parietal tooth median, moderately 

 strong. 



Alt. 27?, diam. 11 ; alt. of aperture lOi mm. 



Alt. 261, diam. 11 ; alt. of aperture 10 mm. 



Turk's Island, Bahamas. 



This species resembles C. glans in general figure and the stout 

 parietal callus ; but the ribs are conspicuously different, peculiarly 

 rough and unfinished in appearance, somewhat like C.felis. 

 Cerion tenuilabre pygmaeum Pilsbry & Vanatta. PI. XI, fig. 9. 



Shell small and rather thin, varying from cyliudric to short oval. 

 Whorls 7 to 82, the latter 2 to 3 of subequal diameter, those above 



