178 BULIMULUS-BOSTRYX-LISSOACME. 



decidedly attenuated above, apex mamillar, smooth. Whorls 7, mod- 

 erately convex. 



Aperture less than half the length of shell, long ovate ; outer lip 

 slightly obtuse, with no perceptible lip-rib within ; columella slightly 

 concave, attenuated at base ; columellar lip dilated above ; parietal 

 callus a transparent glaze. 



Alt. 27,diam. 12 mill.; alt. of aperture 12, width 7 mill. 



Alt. 26, diam. 11 mill.; alt. of aperture 12, width 6 mill. 



" Mexillones," desert of Atacama, Chili (Cuming). 



Bulinus affinis BROD., 1832, p. 106. SOWB., Conch. Illustr., f. 30. 

 Bulimus affinis DESH. in Lam., An. s. Vert, viii, p. 273. REEVE, 

 Conch. Icon., pi. 23, f. 154. PFR., Monogr., ii, p. 207 : vii, p. 172 ; 

 Conchyl. Cab., p. 221, pi. 61. f. 7, 8. HIDALGO, Journ. de Conch., 

 1870, p. 60. B. paposensis PFR., Malak. Bl., iii, 1856, p. 207 ; 

 Monogr., iv. p. 480. 



B. affinis is more slender than B. mejillonensis, with the apical 

 whorls and base of columella attenuated, and with an additional 

 whorl. B. paposensis Pfr. is considered by Hidalgo a synonym. I 

 consider it as at most a slight variety. 



Var. ? paposensis Pfr. Shell compressed- umbilicate, ovate-conic, 

 thin, closely striate and subdecussated-granulate ; diaphanous varie- 

 gated and submaculated with white and corneous lines. Spire convex- 

 conic, the apex acute ; suture subcrenulated. Whorls 6 to 6 J-, some- 

 what convex, the last about as long as spire, a little attenuated at 

 base. Columella somewhat straightened, slightly receding. Aper- 

 ture oblique, oval-oblong; peristome simple, the right margin un- 

 expanded, lightly arcuate, columellar margin dilated and spreading 

 above. Alt. 18, diam. 9J miH. ; aperture 10 mill, long, 5i wide 



Paposo, Atacama desert (Phil.). 



B. CALLOSUS PfeifFer. Unfigured. 



Shell perforate, ovate-conic, rather solid, opaque, dull whitish, 

 ornamented with irregular pellucid streaks. Spire conic, rather 

 acute. Whorls 7, rather flat, the last a little longer than spire ; col- 

 umella shortly receding. Aperture acuminate-oval ; peristome 

 acute, lipped with a thick callus within, which does not extend to 

 the margin. Columellar margin vaultingly reflexed. Alt. 21, diam. 

 11 mill. ; aperture 12 mill, long, 6 wide. (P/ V.). 



Habitat unknown (coll. v. d. Busch) 



B. callosus PFR., Zeitschr. f. Malak., 1846, p. 128 ; Monogr., ii, p. 

 222. 



This may be allied to B. mejillonensis, or it may be a Buliminus. 



