CERION, GROUP XI. 249 



the hase, and wanting on the conic portion, which is marked with 

 growlh-striiz only ; portions of the second and third whorls minutely 

 striate. Aperture truncate-ovate, brown in the throat ; peristome 

 reflexed, but slightly thickened, the ends connected by a thin or 

 moderate parietal callus. Parietal lamella small, low and rather 

 Ion**. Axial lamella small. 



CJ 



Length 34, diam. 13 mill. 



Length 29, diam. 12J mill. 



Bahamas : Rum Key,\u the interior on the western side (Maynard). 



Strophia lentiginosa MAYN., Contrib. to Sci. i, p. 75, f. 11, pi. 7, 

 f. 18 (July, 1889). . 



This species differs from C. album in the smoothness of the whorls 

 of the cone, only those of the cylindric portion of the shell being 

 ribbed. The ribs are noticeably more separated than in C. album. 

 It varies in coloring from white to conspicuously mottled. The 

 mouth is less brown than in C. eleutherse, which is a more slender 

 species. 



XI. Group of C. glans. 



Maynardia DALL, Bull. M. C. Z., xxv, no. 9, p. 121, type C. neg- 

 lectum. 



Shell usually shortly rimate and copiously ribbed throughout, with 

 20-30 ribs on penult, whorl (rarely smooth); parietal lamella usually 

 stout and short. The young shells are usually toothless except for 

 a columellar lamella, but sometimes the Andros form of C. glans has 

 five teeth. The parietal margin is generally raised in a straight ridge 

 or ledge, but this fails in many individuals or races. Outer lip thin 

 or reflexed, thickened and beveled. 



Widely distributed in the northern-central islands of the Bahamas. 



a. Ribs impressed below the suture, forming a subsutural series of 

 low beads. C. martinianum. 



a 1 . Ribs strong, acute and roughly cut. Turk's Island. 



C. blandi. 

 a*. Without the above characters. 



b. Large forms with narrow lip, from islets southeast of New 



Providence. C. ritchiei, p. 250; C. eburneum, p. 252. 



6 1 . Forms of medium size from New Providence and Andros, 



with the immediately adjacent keys and islets, and Gun Cay. 



C. glans, p. 253. 



