ANTILLEAN OBELISCUS. 



while 0. simpsom is as unequivocally an Obeliscus. It is like 

 0. hendersoni in the columella and 'convex Avhorls, but differs 

 by its distinctly striate surface and smaller, much less obtuse 

 apex, the suture of the embryonic whorls being smooth, while 

 in 0. hendersoni it is 'Crenulate to the tip. By their mark- 

 edly convex later whorls these two species differ .conspicu- 

 ously from all the small Cuban Obelisks, 0. simpsoni has 

 some resemblance to Lcplinnrlit striosa (C. B. Ad.), but the 

 parietal margin and columella are of a different shape. 



26. 0. SWIFTIANUS (Pfeiffer). PI. 30, figs. 1, 2, 3, 4. 



"Shell imperf orate, subulate, thin, slightly striatulate, a 

 little shining, diaphanous, waxen. Spire regularly tapering, 

 the apex rather obtuse; suture light, simple. Whorls 7, a 

 little convex, the last slightly exceeding one-fourth the length, 

 rounded bas'ally. Aperture oblique, oval-oblong; peristome 

 simple, acute, the right margin aTching forward, base reced- 

 ing; columellar margin somewhat calloused, very shortly re- 

 flexed. Length 7, cliam. 2 mm., aperture 1.75 mm. long 

 (Pfr.). 



St. Thomas (Swift, type loc.). Porto Rico : San Juan, 

 Fajardo, Ceiba, Hurnacao, Luquillo (Blauner) ; Quebradillas 

 (Gundlach); Island of Vieque. St. John (Bland). St. 

 Croix (Griffith) . Guadeloupe and St. Martin (Maze). Cuba 

 at Havana (B. Arango) . Bermuda, near Tuckerstown (Heil- 

 prin et al.) . Mauritius (Nevill, see p. 157). 



Bulimus swiftianus PFR., Zeitschr. f. Malak., 1852, p. 150; 

 Conchyl. Cab., p. 256, pi. 69, f. 9-11; Monogr., iii, p. 399; 

 iv, 460; vi, 99. Stenogyra siviftiana Pfr., SHUTTLEWORTH, 

 Diagnosen, etc., no. 6, p. 140 (1854). MAZE, Journ. de Con- 

 chyl., 1883, p. 7 (Guadeloupe) ; 1890, p. 23 (St. Martin) - 

 Obeliscus swiftianus Pfr., CROSSE, Journ. de Conchyl., 1892, 

 pp. 27, 62 (Porto Rico, Vieques). Spiraxis s., MARTENS, 

 Jahrb. D. M. Ges., iv, 1877, p. 345. Opeas s., STREBEL, Bei- 

 trag, v, p. 107, pi. 17, f. 14. PILSBRY. this vol., p. 157.- 

 Stenogyra gutierrezi ARANGO, Contrib. Fauna Malacologica 

 Cubana, p. 91 (1878). 



I have examined numerous e les of this form from all 



