,S(U:TH AMERICAN OBELISri's. 



Hidinius haplostylus PFR., Symbols a/d Hist. Hel., iii, p. 

 84 (1846) ; Monogr., ii, p. 152; vi, 94. HIDALGO, Viaje al 

 Pacdfico, p. 132; J. de Conch., 1875, p. 130. LUBOMIRSKI, 

 Proc. Zool. Soc., 1879, p. 724. Obeliscus h., COUSIN, Bull. 

 Sac. Zool. France, xii, p. 238, 1887. Bulimus terebraster 

 REEVE, Conch. Icon., v, pi. 52, f. 341, not of Lamarck. 



Pfeiffer's description and Reeve's figure (fig. 69) of the 

 type are given, with the figure of a smaller specimen (fig. 

 68) . The shell has a very large apex of a pale corneous tint, 

 the embryonic whorls being slightly roughened with weak 

 arcuate wrinkles. There is a whitish line below the finely 

 but indistinctly crenulate suture. The shell has not the gloss 

 of 0. ciineus, and the shape of the spire is quite different, 

 Length 30, diam. 8, aperture 8.5 mm., diam. -of second whorl 

 2.5 mm. ; whorls 



13. 0. JOUSSEAUMEI Cousin. PL 36, fig. 78. 



Shell elongate, turriculate, with obtuse summit and 

 rounded base ; quite thin, fragile and transparent, orna- 

 mented with fine, close and quite irregular stria?, sometimes 

 showing superficial spiral striae, appearing to be the result 

 of erosion. Yellow, more or less tinted with reddish or 

 greenish-yellow. AVhorls 9, regularly and slowly increasing, 

 separated by a linear, sharply cut suture ; early whorls nearly 

 smooth, forming a stout obtuse apex; following whorls but 

 slightly convex, the outline appearing as a straight line in- 

 terrupted at intervals by the suture. Last whorl noticeably 

 angular a little below the middle. The aperture is oval, a 

 little angular posteriorly, and noticeably exicised by the 

 penult, whorl ; peristome unexpanded, thin and acute. Colu- 

 mel'la nearly straight, a little stronger than the outer lip; 

 parietal callus weak. Length 27, diam. 8, aperture 8x5 mm. 



Ecuador: descent of Azagues tto Molobog, in a shady 

 ravine, under dead leaves, elevation about 2,400 meters 

 (Cousin). 



Obeliscus jousseaumei COUSIN, Bull. Soc. Zoologique de 

 France, xii, 1887, p. 238, pi. 4, f. 1. 



The description is somewhat abbreviated from that of 



