CERION, GROUP XII. 265 



from a richly striped color-pattern to pure white. These variations 

 are apparently not racial. 



Various members of the groups of C. maritimum, O. cyclostoma, 

 O. crassilabris, C. gubernatorium and C. glans, approach forms of 

 this group in sculpture. 



Three species, mnrtensi, multistriatum and marmoratum, are from 

 the Crooked Island group. C. eximium is from Cat Island, agresti- 

 num from New Providence, and bendalli from Abaco. The locali- 

 ties of C. grune^i and O. fordi are unknown. Perhaps C. venustum 

 Poey (p. 203) belongs to the group. 



C. EXIMIUM (Maynard). PI. 38, figs. 76, 77, 78. 



Shell deeply rimate, moderately solid, cylindric-oval ; white, cop- 

 iously striped with dark chestnut ; densely and finely rib-striate. 

 Whorls 9^, scarcely convex, the last paler at the base, the umbilical 

 area impressed. Terminal cone rather short, with convex outlines, 

 the apical whorls brownish-corneous. Aperture ovate, dark bluish- 

 gray within ; peristome narrowly reflexed, white, thick, the margins 

 joined by a rather strong parietal callus, thin in the middle, thick at 

 the sides, or thick throughout. No noticeable axial lamella. Pari- 

 etal lamella very small, rather short ; behind it a low, rounded ridge 

 revolves upward into the penultimate whorl, there being an excavation 

 or gutter encircling the axial pillar (fig. 78). 



Length 231, diam. 9^-10 mill. 



Length 22, diam. 9 mill. Bahamas : Cat Island. 



Strophia eximea MAYN., Contrib. to Sci., ii, p. 177, 178, fig. 

 59 a, b, 61 , c (December, 1894). 



In this species, of which part of the original lot is before me, the 

 striation is perceptibly less fine than in O. martensianum. The ridge 

 running inward from the inner end of the parietal lamella seems to 

 be constant and characteristic. Mr. Maynard mentions very small 

 specimens without giving the dimensions. 



Var. FRATEKNUM, n. v. PL 38, figs. 79, 80. 



Shell finely rib-striate, streaked and striped with reddish-brown on 

 a white ground, as in C. eximium, from which it differs in the follow- 

 ing particulars : The form is short, broad and oval ; whorls 8^; um- 

 bilical area much smaller ; interior without a spiral ridge and gutter 

 encircling the central column; parietal lamella decidedly stronger. 



