SOUTH AMERICAN OBELISCUS. 257 



Cousin. It seems to be related to 0. haplostylus, but the 

 contour is wider, the spire more conic and regularly tapering. 



14. 0. PUSILLUS (H. Adams). PI. 36, fig. 77. 



Shell imperforate, turrite, rather thin, striate, slightly shin- 

 ing, pale tawny. Spire long, the apex rather obtuse ; suture 

 impressed, not margined. Whorls 7, rather flattened, the 

 last one-fourth' the total length, rounded basally. Columella 

 slightly twisted above. Aperture small, oval ; peristome sim- 

 ple, straight, the right margin slightly arcuate, columellar 

 margin a little reflexed. Length 8, diam. 2 mm. (H. Ad.). 



Eastern Peru (E. Bartlett). 



Rumina (Obeliscus) pusilla H. AD., Proc. Zool. Soc. Lond., 

 1866, p. 441, pi. 38, f. 1. 



Colombian Species. 

 These aberrant forms require further study. 



15. 0. VIRESCENS (da Costa). PI. 36, fig. 81. 



Shell oblong-turrite, very thin, pellucid, glossy. Whorls 8, 

 a little convex, the sutures impressed, longitudinally very 

 closely raised-striate ; columella pale, reflexed; lip simple, 

 acute; epidermis thin, greenish. Aperture subelongate, one- 

 third the length of the shell. Length 37, diam. 12, aperture 

 14x5.5 mm. (da Costa}. 



Colombia : Valley of the Cauca river. 



Stenogyra (Spiraxis) virescens DA COSTA, Proc. Malac. 

 Soc. Lond., iii, p. 82, pi. 6, f. 10 (July, 1898). 



16. 0. BLANDI (Pfeiffer). PI. 36, figs. 83, 84. 



Shell perviously and narrowly unibilicate, turrite, rather 

 thin, obliquely closely thread-striate, opaque, calcareous; 

 spire long, attenuate below (the wide, obtuse apex; suture 

 slightly impressed. Whorls 17, flat, the last about one- 

 seventh the total length, subangular. Aperture slightly ob- 

 lique, subtetragonal ; peristome simple, unexpandecl, the colu- 

 mellar margin a little reflexed above. Length 22, diam. 

 nearly 7, aperture 4x3 mm. (Pfr.). 



