252 SOUTH AMERICAN OBELISCUS. 



I. Large forms, over 50 mm. long. 



a. Summit very obtuse; aperture subvertical. 



0. cuneus, no. 9. 

 aa. Summit attenuate; aperture oblique. 



0. major, no. 10. 

 II. Smaller forms, 25 to 50 mm. long. 



a. Spire very thick above ; length. 5 times the diam. 



0. pairensis, no. 11. 



en. Spire regularly tapering; length 3^2 to 4 times 

 diam. 



b. 39 x 10 mm., whorls 9. 0. haplostylus, no. 12. 

 bb. 27x8 mm., whorls 9. 0. jousseaumei, no. 13. 



bbb. 36x9 mm., whorls 10. 0. cuneus minor, no. 9. 

 III. Small, 8x2 mm., with 7 whorls. 0. pusillus, no. 14. 



9. 0. CUNEUS (Pfeiffer). PL 35, figs. 56, 57, 58, 59. 



Shell imperforate, turrite-<elub-shaped, solid, smooth, arcu- 

 ately irregularly substriate, tawny. Spire turrite, the apex 

 rather acute ; suture minutely crenulate, bordered with an 

 impressed line. Whorls 10, flat, the last two-sevenths the 

 total length, rounded basally. Columella slightly arcuate, 

 narrowly calloused, flat. Aperture sub rhombic- ova 1 ; peri- 

 stome simple, unexpanded, the right margin very slightly 

 arcuate, basal margin forming an obtuse angle with the 'colu- 

 mella. Length 63, diam. 16, aperture 18.5x10 mm. (Pfr.). 



Ecuador: on the Mira river (Bourcier, type loc.). Nane- 

 gal (Martinez) ; Val de Pilaton, about 3,000 meters above 

 sea level (Boetzkes) ; Los Puentes near Cfualea at about 1,500 

 meters, on low herba.ge in very damp places (Cousin). 



B-ulinntx us PFR., Proc. Zool. Soc., 1852, p. 154; M'on- 



ogr., iii, p. 390; Conchyl. Cab., p. 96, pi. 32, f. 11, 12.- 

 HIDALGO, Journ. de Conch., 1870, p. 56 ; Viaje al Pacifico, 

 Moll., p. 97. Obelise ttx mm- us Pfr., MILLER, Malak. BL, xxv, 

 1878, p. 195; n. F., i, 1879, pi. 6, f. 3 b, var. min or. COUSIN, 

 Bull. Soc. Zool. de France, xii. 1887, p. 237.Bulimus fair- 

 mnlminiif; PETIT de la SATSSAYE, Journ. de Conch., 1853, p. 

 156, pi. 5, f. 8. 



The surface is glossy, \vitli only fainl striation, and eov- 



