64 BULIMULUS-SOUTH AMERICAN. 



Species of N. E. South America, Brazil, Bolivia, Argentina, etc. 



B. ORTHODOXUS (Drouet). PL 10, figs. 4, 5. 



Shell narrowly umbilicated, oval-conic, thin, a little solid, 

 slightly striated, lusterless, warm ashey-grayish or whitish, subtrans- 

 lucent. Whorls 5, regularly increasing, slightly convex, the last 

 somewhat ventricose. Apex conic, rather acute. Aperture oval, 

 half the total alt. of shell ; peristome a trifle thickened, the colu- 

 mellar margin reflexed. Alt. 15, diam. 8 mill. ; alt. of aperture 8, 

 width 5 mill. (Drouet). 



Ilet-la-Mere, FrenchGuiana, under stones on dead leaves (Eyries). 



Bulimus orthodoxus DROUET, Essai sur les Moll. Terr, et Fluv. 

 de la Guyane Francaise, p. 62, pi. 1, f. 14, 15 (1859). 



It is allied to the white, one-colored form of B. exilis, but easily 

 distinguished by the smaller size, more ventricose form and the 

 less lengthened aperture. (Drouet). 



B. EGANUS (Pfeiifer). PI. 11, figs. 6, 7. 



Shell perforate, ovate-conic, thin, under the lens seen to be obso- 

 letely decussated with longitudinal and spiral lines. Surface hardly 

 shining, having a frosted appearance, brown-corneous. Spire conic, 

 the apex obtuse ; suture moderate. Whorls 5, moderately convex, 

 the last slightly longer than the spire, obsoletely angulated in the 

 middle, the base a trifle compressed. Aperture oblique, subellipti- 

 cal, somewhat angular at base ; peristome simple, thin, the right 

 margin spreading, columellar margin dilated above, reflexed and 

 subappressed. Alt. 13, diam. 6j mill. ; aperture 7 mill. long. 



Ega, Brazil. 



Bulimus eganus PFR., Monogr., iii, p. 437 ; P. Z. S., 1851, p. 258 ; 

 Conchyl. Cab., p. 85, pi. 30, f. 11, 12. 



A small species, with obsolete decussated sculpture, probably 

 allied to B. buenavistensis. 



B. TENUISSIMUS (d'Orbigny). PI. 10, figs. 91, 92. 



Shell perforate, ovate-conic, very thin, pellucid, scarcely shining, 

 obsoletely and closely decussated by growth striae and delicate spiral 

 lines ; pale corneous, sometimes fulvous. Spire conoid, the apex 

 rather acute, suture simple. Whorls 6, slightly convex, increasing 

 with moderate rapidity, the last whorl convex, not descending in 

 front, somewhat attenuated at base. Columella suboblique, some- 



