CERION, GROUP VIII. 235 



Length 34, diam. 11^; alt. of aperture 10 mill. 



Bahamas : Little Inagua. 



C. sarcostomum P. & V., Proc. A. N. S. Phila., 1896, pp. 321, 

 331, pi. 11, f. 16 (August 4). 



Some specimens are larger than the above dimensions ; one worn 

 and broken " crab-shell " would probably be not less than 40 mill, 

 long if perfect. It is not unlikely that forms occur with the ribs 

 obsolete, as in the allied C. columna, but all the specimens seen are 

 strongly ribbed. 



O. sarcostomum clearly belongs to the immediate group of C. calcar- 

 eum and C. columna. The latter has a very dark aperture, broadly 

 flanged lip and less obtuse apex. G. calcareum lacks sculpture 

 except on the basal whorl, is absolutely cylindrical, with light mouth 

 and excessively short terminal cone, while the present species is 

 more tapering, with the cone decidedly longer, gradually passing 

 into the cylindrical portion. 



C. COLUMNA Pilsbry & Vanatta. PL 34, figs. 5, 6, 7. 



Shell deeply rimate, thick, strong, cylindrical or column-shaped, 

 the later four or five whorls of about equal diameter, those above 

 tapering, forming a cone one-fourth or one-fifth the shell's length* 

 Bluish white, often flesh-tinted on the cone. Whorls 12-13, the 

 first 2 smooth, several following whorls closely and distinctly striate; 

 the median whorls either smooth or having irregular, wide-spaced 

 ribs ; the last whorl with stronger ribs, at least on its latter half. 

 The sutures, which are seam-like on the earlier portion, become 

 somewhat impressed between the whorls of the cylindric portion. 

 Aperture ovate, dark purplish-brown, chestnut-brown or orange brown 

 inside, obstructed by a moderately long, pale brown parietal lamella 

 and a deeply entering oblique columellar lamella ; peristome white 

 or nearly so, broadly reflexed, the terminations joined by a thick and 

 strong parietal callus. 



Length 46, diam. 12J mill. Length 41^, diam. 14^ mill. 



Length 38, diam. 13J mill. 



Bahamas : Turtle Cove, Great Inagua. (Sargent.} 



Strophia iostoma Pfr., BINNEY, Annals of the Lyceum of Natural 

 History of New York, xi, 1876, p. 31, pi. 2, f. 8; Ann. N. Y. 



Acad. Sci., iii, 1884, p. 101, pi. 7, f. c. (jaw and teeth) BLAND, 



Ann. Lye., xi, p. 85. Not Pupa iostoma Pfr Cerion columna 



