WEST CUBAN OBELISCUS. 277 



Stenogyra microstoma Gundlach mss., PFR., Malak. BL, x, 

 1863, p. 246 ; xi, 1864, p. 131 ; Monogr., vi, 96 ; Novit. Conch., 

 p. 373, pi. 87, f. 7-9. ARANGO, Fauna Malacologiea Guyana, 

 p. 91. 



A thick-spired shell with straight 'but weak riblets and 

 rather short whorls. Figs. 43, 44 are from Esperanza topo- 

 types received from Wright. 



Young shells are subperforate with a narrow, simply con- 

 cave columella. As it approaches maturity, the columella 

 becomes more concave and sinuous, so that a nearly full- 

 grown shell viewed from below shows a small central hole, 

 about which the columellar axis revolves (fig. 37). In a 

 later stage (fig. 38) the upper part of the columella expands, 

 standing free from the body, and only adnajte near the upper 

 angle of the mouth. This condition is followed by the adult 

 stage, fig. 43, in which the inner lip (columella and parietal 

 margin) is continuous and straightened, with a swelling or 

 convexity in the middle. The axis, fig. 44, is straight above, 

 becoming sinuous in the later whorls. A fully adult shell 

 from the 'type locality measures, length 15, diam. 3, aperture 

 3 mm., with 10 whorls. 



34. 0. GUNDLACHI ('Arango' Pfr.). PL 31, figs. 14, 16. 



"Shell imperf orate, subulate, solid, closely and arcuately 

 plicate-striate, hardly shining, waxy-whitish. Spire long, 

 regularly tapering, the apex obtuse. Whorls 10, somewhat 

 flattened, the last noft one-fourth the total length of the shell, 

 slightly tapering bas'ally. Aperture somewhat oblique, an- 

 gular-elliptical; peristome simple, unexpanded, the margins 

 joined by a callous, right margin slightly curved forward. 

 Length 17, diam. 3.5, aperture 4x2 mm." (Pfr.). 



Western Cuba: Vifiales (Wright, 'type loc.) ; also Sumi- 

 dero and Pan de Azucar (Arango). 



Stenogyra gundlachi Arango mss., PFR., Malak. BL, x, 

 1863, p. 246. ARANGO, Fauna, p. 90. Bulimus gundlachi 

 Ar., PFR., Monogr., vi, 95; Novit. Conch., p. 374, pi. 87, f. 

 13-15. 



I have figured topotypes received from Wright. The num- 



