278 WEST CUBAN OBELISCUS. 



ber of whorls is more 'commonly 11 than 10 in full-grown 

 shells of 17 mm. length. The rib-like striae are markedly 

 sinuous, being rather strongly bent forward just below the 

 suture. They are much more distinct before the shell has 

 been cleaned, by reason of a thin coat of earth which adheres 

 to the intercostal spaces. The first 2 whorls are smooth. The 

 spire is markedly attenuate above, but the early whorls are 

 not enlarged or bulging. It is a thin shell. While narrow, 

 this is decidedly wider and more robust than the following 

 species. 



35. 0. BLANDIANUS Pilsbry, n. sp. PI. 33, figs. 41, 42. 

 Shell imperforate, column-shaped, very slender, moderately 



solid, of a pale yellowish-'corneous tint. Surface lusterless, 

 sculptured with fine rib-stria which are strongly arcuate just 

 below the suture, then quite oblique and straightened. The 

 riblets are thread-like and narrower than the somewhat un- 

 equal intervals. Whorls 11, the first two smooth, forming a 

 large and obtuse summit. The next 4 or 5 whorls are con- 

 vex and increase slowly, and the remainder are of about the 

 same diameter, and are somewhat flattened. The aperture is 

 small and very oblique, ovate; outer lip thin and sinuous; 

 columella thickened, concave; the parietal margin straight. 

 Length 14.5, diam. 2.4, length of aperture 2.6 mm. 



Western Cuba. Type 59069 A. N. S. P. 



This species is related by its sculpture and apertural char- 

 acters to 0. gundlachi, but differs conspicuously in shape, be- 

 ing far more slender, with a smaller aperture. The later 

 whorls are very long and obliquely -coiled. It differs from 

 0. angustatus by the longer whorls, curved riblets, etc. 



36. 0. ANGUSTATUS (Guudlach). PL 33, figs. 39, 40, 45. 

 Shell cylindric-subulate, imperforate, sculptured with 



nearly straight ribs. Whorls 11, subconvex. The apex ob- 

 tuse. Aperture small, subrhomboidal. Columella straight- 

 ened. Length 12, diam. 2.5, aperture 2 mm. long, 1.25 wide 



(Gundl.). 



Western Cuba : Monte Rangelino, under stones and fallen 

 leaves, type loc. ; Hato Caimito (Gundl.). 



