128 MACROCERAMUS, HAITI. 



last a little narrower, rounded, about equal to one-fourth the 

 length, having two chestnut basal bands. Columella obso- 

 letely folded. Aperture sub vertical, lunate-rounded, the 

 peristome thin, with converging margins; right margin sin- 

 uous, with a thread-like expansion, columellar margin dilated. 

 Length 18, diam. 6.5 mm.; apert. 4.66 mm. long, 4.33 wide," 

 (Pfr.) 



Santo Domingo: Ocoa (Salle). 



Bulimus tenuiplicatus PFR., Conchyl. Cab., p. 129, no. 170, 

 pi. 42, f. 18, 19; Monogr., iii, p. 363 (1853) ; P. Z. S., 1852, 

 p. 139 (1854). Macroceramus t. PFR., Monogr., iv, 688. 

 CROSSE, J. de C., 1891, p. 130. 



The original description is given above. The specimens 

 figured were received from Salle, and are doubtless part of 

 the original lot. 



The shell is slender, with almost straight lateral outlines, 

 the convexity mentioned by Pfeiffer being barely perceptible. 

 2y 2 smooth apical whorls are purplish-brown, the rest being 

 whitish, with a more or less developed pattern of small spots 

 in three spiral series, and arranged along narrow, oblique, 

 brown streaks; and there is a narrow band below the periph- 

 ery, a small spot at the axis, and another band midway of the 

 base, which is also radially streaked. This pattern may be 

 either quite distinct or very much reduced. The sculpture is 

 a fine, close striation throughout, the striae as wide as their 

 intervals. Specimens measure : 16.3 x 5.3, apert. 4.3 mm. ; 

 19 x 5.6, apert. 4.3 mm. ; 15.5 x 5.5, apert. 4 mm. Whorls 

 from 11 to 12i/ 2 . 



9a. Yar. SWIFTIANUS Pilsbry, n. v. PL 23, figs. 52, 53, 54. 



Shell shortly, openly rimate, turrite, with the shape of M. 

 lineatus. White, with a dark band below the periphery, two 

 narrower bands above it, continuous or interrupted, and on 

 the base there is a band within the umbilical area and another 

 midway between that and the subperipheral band; all of the 

 bands crossed by rather widely and irregularly -spaced longi- 

 tudinal lines. Early whorls blackish-brown or purplish. 

 Sculpture of rather coarse, but low, close striae throughout 



