BRACHYPODELLA, S, STE. 85 



Thomas agree. They often retain the apex entire. The types 

 were probably from one of the Virgin Islands, as Porto Rican 

 shells are mainly larger, less tapering above, and more widely 

 and more constantly truncate, a specimen measuring: 1. 12, 

 d. 2.3 mm., whorls 10. This form has been called var. major 

 Pfr. B. perplicata Fer. differs from pallida in little but its 

 larger size. An erroneous locality, Jamaica, has found its 

 way intp some of the books, probably traceable to a shell sent 

 to Adams by Cuming. 



34. B. CHORDATA (Pfeiffer). PI. 7, figs. 25, 26, 27. 



Shell cylindric, the upper third or half tapering to a nar- 

 row truncation, or rarely an entire apex; thin, white or cor- 

 neous-white, lusterless; sculptured with oblique, straight, 

 tvidely-spaced white narrow ribs, which are generally a little 

 enlarged at the ends; the intervals very delicately thread- 

 striate. Whorls slightly convex, the last strongly carinate 

 below, concave above the keel, projecting free and descending. 

 Aperture oblique, rounded, obtusely angular at the base and 

 outer margin ; peristome broadly reflexed, white, excavated 

 within at the outer angle. Axis slender and straight. 



Length 10.3, diam. 2 mm., whorls remaining 12. 



Length 7.6, diam. 1.8 mm., whorls 10. 



Length 10, diam. 2.2 mm., whorls 15 (entire). 



St. Croix: Christiansted (Riise, Swift). 



Cyl. chordata PFR., Proc. Zool. Soc. Lond., 1855, p. 117; 

 Malak. Bl., 1855, p. 102, pi. 5, f . 10, 11 ; Conchyl. Cab., p. 48, 

 pi. 5, f. 21-23; Monogr., iv, p. 708. SOWERBY, C. Icon., xx, 

 pi. 5, f. 38. 



A beautiful white species, related to B. pallida, from which 

 it differs chiefly in the reduction of the sculpture to narrow, 

 wide-spaced, straight riblets. Figs. 25, 26 are after Pfeiffer. 



"Cylindrella 8. Croixii Pfr.," Schaufuss, Moll. Syst. et 

 Catal. Conch. Paetel, 1869, p. 68, and C. santacroixi Sh., of 

 the Catalog der Conchylien-Sammlung von Fr. Paetel, ii, 

 1889, p. 250, are nude names possibly referable to this species, 

 as none other has been reported from St. Croix. 



