146 MACROCERAMUS, CUBA. 



whorls corneous. Surface nearly lusterless, closely rib-striate 

 throughout. Whorls 9, convex, the last rounded, without 

 basal keel. Suture simple. Aperture small, oblique; peris- 

 tome not expanded, thickened and obtuse, the margins ap- 

 proaching above; columellar margin built forward, in the 

 plane of the outer lip. 



Length 7, diam. 2.5 mm. 



Length 7.5, diam. 3 mm. (type). 



Eastern Cuba : Santiago de Cuba, at the Aguadores (type 

 loc.), and Lagunas, and at the Caimanera of Guantanamo, 

 under and on stones (Gundlach). 



M. inermis Gundl. in PFR., Malak. Bl., v, 1858, p. 183, no. 

 19 ; Monogr., iv, p. 690 ; Novit. Conch., p. 407, pi. 93, f . 33-35. 

 ARANGO, Fauna, p. 84. 



Smaller than any other known Macroceramus of eastern 

 Cuba. It is closely rib-striate throughout, the riblets usually 

 lighter than the ground. It is a smaller shell than the cen- 

 tral Cuban M . angulosus, and is quite unlike that in the form 

 of the columellar lip. 



Binney, in Ann. N. Y. Acad. Sci., iii, p. 126, states that the 

 radula of a specimen of M. inermis from Curacao, collected 

 by Mr. J. S. Gibbons (cf. Gibbons, Journ. of Conch., ii, 1879, 

 p. 136), is like that of M. gossei. The specimen could hardly 

 have been really this Cuban species; it was evidently a super- 

 ficially similar Microceramus, perhaps allied to or identical 

 with "Pineria" bonairensis from the adjacent island of 

 Buen Ayre. 



30. M. ARANGOI Pfeiffer. PI. 15, figs. 3, 4. 



Shell subperforate, turriculate, rather solid, closely costu- 

 late, a little glossy; white, variously marked with dots and 

 flames of corneous. Spire swollen-turrite, the apex white, 

 acute; suture somewhat denticulate by the riblets. Whorls 

 9-10, a little convex, the last narrower, rounded, obtusely 

 thread-carinate. Aperture oblique, irregularly rounded, the 

 peristome simple, only a trifle expanded, the margins ap- 

 proaching, columellar margin slightly dilated, somewhat ap- 

 pressed. Length 8, diam. 3, height of aperture 2 mm. (Pfr.). 



