MACROCERAMUS, CUBA. 145 



periphery, and interrupted with irregular blackish spots 

 (fig. 18). The ordinary color is livid bluish- white, becoming 

 fleshy on the spire, dark above, with but few dark spots at 

 the periphery. They are often worn, and show dull, flesh- 

 tinted patches. 



28. M. COSTULATUS 'Gundl.' Pfr. PI. 20, figs. 10, 11, 12. 



' Shell rimate, oblong-turrite, solid, closely, somewhat ob- 

 liquely ribbed; whitish, marked with brown streaks, which 

 do not reach to the suture above. Spire regularly tapering, 

 terminating in a corneous, acute apex, which is often decid- 

 uous. Suture deep, crenulated by the projecting ribs. 

 Whorls 8 to 11, convex, the last contracted in front, the base 

 indistinctly thread-keeled. Aperture vertical, obliquely oval, 

 brown inside; peristome continuous, adnate, obtuse, the right 

 margin unexpanded, very strongly arcuate above ; columellar 

 margin subappressed. Length 9-11, diam. 3.5-4.3, length of 

 apert. 2.75 mm." (Pfr.) 



Eastern Cuba: Caimanera, in Guantanamo (type loc.), 

 and Punta Maisi (Gundlach). 



M. costulatus Gundl. in PFR., Malak. BL, vi, 1859, p. 94; 

 xiii, 1866, p. 59; Novit. Conch., p. 387, pi. 89, f. 29, 30; 

 Monogr., vi, 353. ARANGO, Fauna, p. 385. 



The original description is given above. The ribbed shell, 

 contracted, obliquely oval aperture, with the peristome con- 

 tinued in a strong ledge across the parietal wall, are char- 

 acteristic. 



The ribs are often quite separated, as in pi. 20, fig. 10, and 

 the spire frequently does not taper regularly, but is more 

 rapidly attenuate above, somewhat swollen below. The pro- 

 toconch, when retained, is white or whitish. The shell is 

 often smaller than the original specimens. 



Length 9, diam. 3.5 mm., whorls 10 (entire). 



Length 8, diam. 3.5 mm., whorls 9 (entire). 



29. M. INERMIS Gundl. PI. 15, fig. 2. 



Shell shortly rimate, long-turrite ; white or whitish, nearly 

 uniform or with indistinct, wide brown streaks, the earlier 



