266 



ANTILLEAN OBELISCUS. 



Haitian Species. 



Achatina dunkeri Pfr., Spiraxis or Euspiraxis dunkeri of 

 some authors, has a Stenogyroid appearance, -but it is Olea- 

 cinoid, and the type of the genus Dolicholestes Pils., q. v. 



23. 0. CLAVUS Pilsbry, n. sp. PL 32, figs. 19, 20, 21, 22. 



Shell imperforalte, thin, pale yellow or yellowish, glossy, 

 weakly and very obliquely striate. Very narrow, the diam- 

 eter equal to the length of aperture, and .contained five or 

 six times in the 'total length of the shell, the lower three- 

 fourths of the length slowly tapers or is almost cylindric, the 

 upper fourth is slightly contracted, the apex obtuse. Whorls 

 11 (10% to 12), the apical one hemispherical, corneous, the 

 following whorls slightly convex, slowly increasing, later 

 whorls being more flattened and longer. The aperture is 

 very oblique, ovate. The outer lip is a trifle sinuous, thin. 

 Columella slightly concave, almost straight in the middle, 

 narrowly calloused, curving regularly into the basal lip. 



Length 20.6, diam. 3.9, aperture 3.9 mm., diam. at second 

 whorl 1 mm. (figs. 21, 22, type). 



Length 21, diam. 4.1, aperture 4.1 mm. 



Length 24, diam. 4, aperture 4 mm. 



Haiti: fsans Souci, near Cape Haitian (type loc.) ; Char- 

 rnette; Cape Haitian (Henderson and Simpson). 



This is a perplexing form of the terebraster group, col- 

 lected in some quantity by Messrs. Henderson and Simpson. 

 It differs from terebraster by its constantly narrow contour, 

 none of the large series taken approaching Porto Eican tere- 

 Iraster in shape, though as usual in Stenogyrine snails, there 

 is a wider and narrower phase, as shown in the measurements 

 and on the plate. 



Var. flavus nov. PI. 30, fig. 18. A very dosely related or 

 specifically identical form occurs in Eastern Cuba at San- 

 i i;igo. Specimens are before'me bearing the erroneous names 

 Sululina succinea Gundl. and 8. megalogyra Gundl., the 

 latter received from Poey. They differ from the Haitian 

 types in having the aperture a trifle longer and narrower, 

 and the she]], when full grown, is slightly more solid and 



