54 BRACK YPODELLA, S.-G. AMPHICOSMIA. 



its lower side, which is crenulated by the riblets crossing it, 

 and is bounded on each side by an impressed furrow. That 

 on the outer side is more conspicuous, on account of a rounded 

 swelling parallel with the crest, and terminating in the angle 

 of the outer lip. These features are also characteristic of B. 

 truncatula. 



10. B. DOHRNI (Maltzan). PI. 3, figs. 6-12. 



Shell rimate-perf orate, long-turrited, a little decollate, 

 rather thin, obliquely rib-striate, the ribs delicate, distant; 

 corneous, subpellucid. Whorls numerous (20-22), a little 

 convex, very slowly increasing, the lower 6 or 7 of about equal 

 diameter, the last encircled by a very distinct keel at the base, 

 free, projecting a rather long distance; suture simple, im- 

 pressed. Aperture subovate, lightly angularly channelled 

 outwardly, the peristome expanded, a trifle thickened. Length 

 19, diam. 3.5 mm. (Maltzan). 



Haiti: Sans-souci (H. Eolle, 1887-88); La Ferriere (Hen- 

 derson & Simpson). 



Cyl. dohrni MALTZ., Nachrichtsblatt d. D. Malak. Ges., xx, 

 Dec., 1888, p. 177. CROSSE, Journ. de Conchy!., 1891, p. 146, 

 pi. 2, f. 1, a, I. 



The specimen figured by Crosse, received from Rolle, is 16 

 mm. long, and has 14 or 15 whorls, according to the figures 

 (pi. 3, figs. 11, 12). The shells collected at La Ferriere by 

 Henderson and Simpson (pi. 3, figs. 6, 7, 8, 9, 10) seem to 

 have fewer whorls, and the larger specimens are rose-colored. 

 I have thought it well to fully describe them : 



Shell cylindric, turrited, the upper half tapering to a nar- 

 row truncation; rose-colored, becoming paler below, the last 

 whorl white or reddish-brown, or nearly so; thin; surface 

 lusterless, sculptured with oblique, thread-like, arcuate, or 

 somewhat sigmoid rib-strias, separated by spaces of two or 

 three times their own width. Whorls slightly convex, the last 

 broad at the base, produced in a rather long free neck, which 

 is rounded above, very strongly carinate at the periphery of 

 the flattened base, concave above and below the stout keel. 

 Aperture obliquely short-oval, the peristome narrowly re- 



