SOUTH AMERICAN OBELISCUS. 247 



Brazil. 



Bulimus obelise us Moric., PFR., Monographia, ii, p. 152, 

 and of DESHAYES in Fer., Hist., pi. 142 A, f. 5, 6; not of 

 Moricand. Bulimus carplwdes PFR., Conchyl. Cab., p. 108, 

 pi. 34, f. 2; Monogr., iii, p. 396 (1853). 



This is a more slender and less solid species than the closely 

 related 0. obeliscus, with more whorls in sheik of equal 

 length. ' Pfeiffer's figure, copied on my plate, well repre- 

 sents it. A specimen before me measures, length 72, diam. 

 15, diam. at second whorl 3, length of aperture 14.5 mm., 

 whorls 15. Deshayes has figured a larger shell, .about 79 x 

 17 mm. . 



3. 0. PLANOSPIRUS (Pfeiffer). PI. 34, fig. 52. 



Shell imperforate, turrite, solid, closely wrinkle striate, ob- 

 soletely decussate with impressed lines, alabaster white under 

 a deciduous tawny cuticle. Spire elongate, at the apex pass- 

 ing into an obtuse cone ; suture impressed. Whorls 13, nearly 

 flat, the last about one-fifth the length, obsoletely angular 

 below the middle. Columella rather narrow, calloused. 

 Aperture oblique, truncate-oblong; peristome simple, unex- 

 panded. Length 84, diam. 17, aperture 16x8 mm. (Pfr.) . 



Habitat of type from Cuming coll. unknown. Head waters 

 of the Mucury river in eastern Minas Geraes, Brazil (Lieut. 

 Will). 



Bulimus planospirus PFR., Proe. Zool. Soe., 1852, p. 60; 

 Monogr., iii, p. 396; Conchyl. Cab., p. 108, pi. 34, f. 3.- 

 Stenogyra planospira Pfr., DOHRN, Jahrb. D. MaJbak. Ges., 

 x, 1883, p. 354. 



"Differs from B. obeliscus in sculpture, the wider and 

 flatter whorls and the apex" (Pfr.}. Dohrn notes that it 

 differs from the very closely related 0. obeliscus by the flat- 

 ter, more rapidly increasing whorls and the consequently 

 greater length of the aperture, while tangible differences in 

 the sculpture are not present. I have not seen the species. 



4. 0. SYLVATICUS (Spix et Wagner). PL 34, figs. 54, 55. 

 "Shell long-conic, subturrite, smooth, glossy, pellucid, sub- 



