240 DRYM^EUS, SOUTH AMERICAN. 



lip reflexed; columella short, thin, vertical; parietal wall covered by 

 a rose colored callus. 



Alt. 26, diam. 16 ; alt. of aperture 14 mill. (Specimen). 



Alt. 25, diam. 12* mill. (Old., B. lautus). 



Alt. 24, diam. 12 ; alt. of aperture 12 mill. (Pfr., B. fallax}. 



Equador, at Tunguragua (Bourcier), Quito (Couthouy, Paz and 

 Martinez), Nanegal (Stu'bel), Tumbaco (Bostzkes), Esmeraldas 

 (Moritz Wagner), Hacienda of Schiquilpe, on a ridge ramifying 

 from the volcano of Pichincha, and along the road between Aloag 

 and Chones, Canton of Megia (Cousin). 



Bulimus fallax PFR., P. Z. S., 1852, p. 156 ; Conchyl. Cab., p. 98, 

 pi. 32, f. 5, 6; Monogr., iii, p. 375 ; viii, p. 113. HIDALGO, Journ. 

 de Conchyl., 1870, p. 50; Mol. Viaje al Pacif., p. ll. Otostomus 

 (Drymceusty fallax MARTENS, Conch. Mittheil., p. 161. Goniosto- 

 mus fallax MILLER, Malak. Blatt., xxv, p. 191. Hamadryas fallax 

 COUSIN, Bull. Soc. Zool. France, 1887, p. 218. Bulimus lautus 

 GOULD, Proc. Bost. Soc. N. H. vi, p. 11 (Oct. 1856) ; Otia Conch. 

 p. 219. PFR., Monogr. vi, p. 77. 



The shell is sometimes perforate, sometimes closed. The peristome 

 varies greatly, being more or less strongly thickened within and ex- 

 panded, sometimes rose-red, sometimes entirely white, and either 

 with no denticle near the basal angle, or with one or two distinct 

 ones. Miller distinguishes two varieties : var. minor, right margin 

 of lip toothless, the entire peristome rose colored ; 6 whorls. Alt. 

 21-22, diam. 10, aperture 10x6 mill. Var. major, peristome white, 

 broadly expanded below in the angle, impressed externally on both 

 sides, the right margin with two teeth within, left margin strongly 

 plicate opposite the teeth; 5? whorls. Alt. 27, diam. 12, aperture 

 13 J x 7 mill. Plain of Tumbaco, 3 hours journey eastward from 

 Quito, 2600 meters above sea level, (500 below Quito). 



Figures 8, 9, 10 on pi. 28 represent a specimen like Gould's lautus 

 except that it has only a very faint rose border within the outer lip, 

 while lautus is described as " peritremate albo, rosaceo vivide sub- 

 marginato." Figs. 43, 44, pi. 33, are Pfeiffer's type of fallax, which 

 is small, red-lipped, generally with a lip-tubercle and but slight 

 basal plication. 



D. ABSCISSUS (Pfeiffer). PI. 50, fig. 89. 



Shell subimperforate, pyramidal, rather solid, rugulose-striate, 

 opaque, whitish ; spire long-conic, rather acute. Whorls 6, a little 



