248 CERION, GROUP X. 



smaller above, reduced to fine, sharp striae on the earlier whorls. On 

 the base of the last whorl the ribs become obsolete. Aperture trun- 

 cate-ovate, brown in the throat; peristome white, reflexed, not much 

 thickened ; the columellar lip dilated, a large umbilical area behind 

 it. Parietal lamella small, rather short; axial lamella small. Pari- 

 etal callus thin. 



Length 33.5, diam. 14 mill. 



Length 35.4, diam. 13.7 mill. (type). 



Length 28, diam. 12.5 mill. 



Bahamas: Rum Key, on the west coast near the salt pond, on the 

 low shrubbery between it and the beach (Maynard). 



Strophia alba MAYN., Contrib. to Sci., i, No. 2, pp. 74, 75, f. 9, 10; 

 pi. 7, f. 17 (July, 1889). 



The umbilical area is larger and the peristome thinner than in O. 

 abacoense. It differs from C. lentiginosum by having the riblets 'ex- 

 tending upon the cone. 



Var. BROWNEI (Maynard). PI. 37, figs. 62, 63. 



Oval, white, robust and heavy, ribbed throughout except the first 

 whorl, the ribs about as wide as the intervals, 20 on the last whorl. 

 Aperture small, yellowish within ; teeth small ; parietal callus very 

 prominent. Length of type, 27^, diam. 12^ mill.; varying from 29 

 to 22J mill. long. 



Near the north side of Rum Key, among low shrubbery (Maynard). 



Strophia brownei MAYN., Contrib. to Sci. i, no. 4, p. 196, pi. 16, 

 f. 4 (probably issued early in 1891). 



Smaller and thicker than typical album, with thicker peristome and 

 parietal callus. The part of Mr. Maynard's work containing this 

 species bears a false date, "January, 1889," three months earlier 

 than the date of the first number of the same volume. It was re- 

 ceived at this library on April 7, 1891. 



C. LENTIGINOSUM (Maynard). PI. 37, figs. 60, 61. 



Shell with a rather long umbilical suture, large, solid, cylindrical ; 

 white, sometimes uniform or with a few gray spots, but typically 

 mottled profusely with dull brown. Whorls 10, nearly flat, the latter 

 3 of about equal diameter; those above forming a nearly straight- 

 sided cone, the apex obtuse. Sculpture of moderately strong ribs 

 separated by wider intervals, on the lower 2-| to 4 whorls, obsolete on 



