DRYM.EUS, SOUTH AMERICAN. 243 



Bulinus bivittatus SOWB., Conch. Illustr., f. 46. Bulimulus bivit- 

 tatus BECK, Index, p. 65 (1837). Bulimus bivittatus RVE., Conch. 

 Icon., pi. 81, f. 597. PER., Monogr., ii, p. 62 ; vi, p. 81. Otosto- 

 mus bivittatus ADS., Genera, iii, p. 149. 



"Effused in an oblique direction, after the manner of the B. 



a urisleporis." 



Vfir.flexilabris Pfr. PL 28, figs. 13, 14. 



In the single specimen before me the spire of slightly over 7 con- 

 vex whorls is touched with ruddy at the apex ; the first two whorls 

 show the sculpture of the genus, and the last whorl has three spiral 

 brown zones, which are overlaid with a whitish coat, as if frosted, 

 with scattered dots of the dark color. The bands are only faintly 

 visible within the mouth. Surface smooth and glossy, with the 

 faintest traces of incised spirals in places. The sutural creuulation 

 is developed, though less strongly than in typical bivittatus. It was 

 overlooked by my artist. Aperture oblique, slightly less than half 

 the alt. of shell ; the white lip produced in a broad lobe at the basal 

 outer margin. Alt. 25, diam. 13, alt. of aperture 12'3 mill. It is 

 said to be from the Amazon River. 



This I identify with Pfeiffer's unfigured B. flexilabris, the origi- 

 nal diagnosis of which here follows : " Shell shortly rimate-subper- 

 forate, obliquely ovate-turrited, rather solid, nearly smooth, shining, 

 white, with 3 reddish, white dotted bands. Spire high-conic, the 

 apex rather obtuse and black. Whorls 7, a little convex, the last 

 shorter than the spire, obliquely produced, the base subangulate in 

 front. Columella short and twisted, receding. Aperture a little 

 oblique, irregularly subquadrangular; peristome simple, expanded 

 throughout, the right margin straight in the middle, curved above, 

 at base subim pressed and angularly dilated outwards, left margin 

 sloping, forming an angle with the columella, much dilated above. 

 Alt. 28, diam. 12J mill.; aperture inside 1H mill, long, 7 wide' 1 

 (Pfr., P. Z. S., 1853, p. 50 ; Monogr., iii, p. 652). Brazil, Curning 

 collection. 



D. QUADRIFASCIATUS (Angas). PI. 41, figs. 22, 23. 



Shell elougately ovate, rimate, moderately solid, shining, finely 

 longitudinally striated ; white, transversely banded with light 

 brown, the last whorl with four bands, the central one being the 

 widest. Spire conical, apex obtuse ; whorls 6, somewhat convex. 



