-I '2 ANTILLEAN OBELISCUS. 



weakly plicate at base, its edge reflexed. Viviparous. Type 

 0. hasta Pfr. 



The embryonic young shell has a raised spire and straight 

 columella (pi. 40, fig. 5, 0. hasta}. The shape of the apex is 

 so unlike other Obelisks that some ground exists for ranking 

 Pseudobalea as a separate genus. 



There are probably three species of Pseudobalea, one in 

 eastern Cuba, another in northeastern Haiti, the third in 

 Porto Rico; but the relations of the Haitian form to its fel- 

 lows have not been worked out, Pfeiffer considered them all 

 to belong to one species. 



29. 0. DOMINICENSIS (Pfeiffer). 



Shell subperforate, sinistral, turrite, nearly smooth, glossy, 

 olivaceous-corneous. Spire regularly tapering, the apex 

 acute. Whorls 12, convex, the last subangular below the 

 middle. Aperture vertical, suboval; perisitome simple, unex- 

 pended, the columellar margin vertical, narrowly reflexed. 

 Length 11.5, diani. 3 mm., aperture 2.5x1.75 mm. (Pfr.). 



Island of Haiti (Salle, in Cuming coll.) ; Mont Diego Cam- 

 pos (Hjalmarson), in the northern part of the Republic of 

 S. Domingo, at an elevation of 4,000 ft. 



Balea dominicensis PFR., Pro>c. Zool. Soc. Lond., 1851, p. 

 148; Monogr., iii, p. 383; Mailak. Bl., v, 1858, p. 153.- 

 Pseudobalea a., CROSSE, Journ. de Conchy!., 1891, p. 149. 



The exact characters of the Santo Domingan form of 

 Pseudobalea are not known; no specimens from the island of 

 Haiti are accessible to me, and the original description, trans- 

 lated above, is not explicit as to the features of the columella. 

 The original specimen was a small one, and Pfeiffer subse- 

 quently received much larger shells from Porto Rico, prob- 

 ably taken by Riise, which he considered the same as domin- 

 icensis; and he described these under the name Bulimus hasta, 

 making his earlier name a synonym. 



Var. HASTA (Pfeiffer). PI. 32, figs. 28, 29, 30. 



Shell slightly subrimate, sinistral, subulate, thin, striatu- 

 late under a lens, pellucid, tawny-corneous. Spire regu- 



