264 CERION, GROUP XII. 



Length 27^, diam. 11 ; alt. of aperture W mill. 



Length 26 J, diam. 11 ; alt. of aperture 10 mill. 



Bahamas : Turk's Island, 



Gerion blandi PILS. & VAN.J Proc. A. N. S. Phila. 1896, p. 334, 

 pi. 11, f. 7. 



This species resembles the more slender forms of G. glans in gen- 

 eral figure and the stout parietal callus; but the ribs are conspicu- 

 ously different, peculiarly rough and unfinished in appearance, 

 somewhat like C. felts. The locality suggests that it may group 

 elsewhere than with C. glans, but the conchological characters remind 

 only of the glans group. (Dedicated to Thomas Bland.) 



/ C. MARTINIANUM (Ktister). PI. 44, figs. 75, 76, 77. 



Shell shortly rimate, solid, cylindric-tapering, the apical cone 

 rather long and gradually passing into the subcylindric portion ; 

 yellowish-white or flesh-tinted, uniform or inconspicuously mottled 

 with darker. Whorls 9, slightly convex, the first smooth, next 

 .finely striate, the striae gradually increasing in size to moderately 

 strong riblets, 25 to 28 on the penultimate whorl. A furrow below 

 and parallel to the suture defines a subsutural band which appears 

 beaded by the ends of the riblets. Aperture ovate, white or pale 

 yellow, the lip reflexed, moderately thick; parietal callus rather 

 heavy, appressed. Parietal lamella short, axial lamella small. 



Length 20.5, diam. 8.7 mill. 



Length 18.5, diam. 9 mill. Bahamas f 



Pupa martiniana KUSTER, Conchyl. Cab. p. 75, pi. 11, f. 3, 4, 4*. 

 PFR., Monogr. ii, p. 324. SOWB., C. Icon. pi. 2, f. 16. 5. 

 martensi MAYNARD, Contrib. to.Sci. ii, p. 182. 



The habitat of this species is still unknown, although it is not 

 especially rare in the older collections. Named for F. H. W. 

 Martini, author of the earlier volumes (1769-1777) of the Conchylien 

 Cabinet. 



XII. Group of G. martensi. , 



Shell sculptured with very fine, close rib-strife or smooth ; usually 

 variegated richly with dark, irregular stripes; teeth small ; parietal 

 callus thin or heavy, but not forming a straight raised ledge. 



As in the allied G. maritimum group of Cuba, some species are 

 dimorphic, having both smooth and striate forms ; and they vary 



