MICROCERAMUS. 169 



16. M. COSTELLARIS ('Gundl.' Pfr.). PL 27, figs. 40, 41. 

 Shell imperforate, acutely conic, rather solid; white, with 



a series of triangular or irregular corneous spots above the 

 periphery, the apical whorls black. Surface lusterless, sculp- 

 tured throughout with very oblique rib-stricz much narrower 

 than their intervals. Spire with nearly straight lateral out- 

 lines. Whorls 9, convex, the last rounded peripherally. 

 Aperture small, oblique, the peristome blunt, not expanded, 

 the columellar margin vertical above, simple. 



Length 6.7 to 7.5, diam. 4.2 mm. 



Length 6.2, diam. 3.7 mm. 



Length 8.3, diam. 4.5 mm. (type). 



Western Cuba: Vinales, under dead leaves (Wright). 



Macroceramus costellaris Gundl. ms., PFR., Malak. Bl., xi, 

 p. 16, no. 72 (1863) ; Monogr., vi, p. 354. ARANGO, Fauna, 

 p. 86. 



Description and figures from topotypes received from 

 Wright. It resembles M. latus, but that species is perforate, 

 only obsoletely striate on*the last whorl, and differs in color- 

 pattern. 



17. M. PAIVANUS (Pfeiffer). PL 27, fig. 36. 



Shell imperforate, conic-turrite, solid, smoothish, opaque, 

 cretaceous. Spire high-conic, the apex black, acuminate. 

 Whorls 9 to 10, rather flattened, the upper ones sometimes 

 variegated with pale corneous, last whorl rounded basally. 

 Aperture diagonal, rounded-lunar, the peristome simple, 

 margins slightly converging, the right margin unexpanded, 

 somewhat spreading, columellar margin adherent. Length 

 9-9.5, diam. 4.5 mm., aperture 3 mm. high. (Pfr.) 



Western Cuba: Luis Lazo, in the municipal dist. of San 

 Juan y Martinez (Wright) ; Pan de Guajaybon (Wright, 

 teste Arango). 



Macroceramus paivanus PFR., Malak. BL, xiii, 1866, p. 61, 

 no. 19 ; Monogr., vi, p. 354. ARANGO, Fauna, p. 86. 



A whorl or two following the black apical whorls are more 

 or less maculate with black-brown, and the rest of the shell 

 may be either almost uniform cream-white, or sparsely dotted 



