64 BRACHYPODELLA, S. STR. 



Santo Domingo (W. M. Gabb). 



This form agrees partially with the description of B. goul- 

 diana, but all the specimens are entire or nearly so (that last 

 measured above having lost the apical whorl only) ; the sculp- 

 ture is even finer than I would suppose was intended by 

 Pfeiffer's expression " confertissime costulato-striata," and 

 the suture is not at all denticulate. The shell seems also to 

 be somewhat less wide, and having its greatest diameter at the 

 upper third, would hardly be described as " turrita." The 

 spiral curvature of the axis is similar to that of the Cuban B. 

 turcasiana, a more coarsely sculptured species. The apex 

 (fig. 54, x 20) does not differ materially from that of B. imi- 

 tatrix. 



Section BRACHYPODELLA s. str. 



Brachypodella Beck, 1837, for perplicata Fer., collaris Lm., 

 subula Fer., antiperversa Fer. Mychostoma in part, ALBERS, 

 Die Hel., 1850, p. 207, for Cyl. subula Fer., Pfr., collaris Fer., 

 gracilicollis Fer., hanleyana Pfr., pallida Guild., seminuda 

 Adams. C. subula Fer. selected as type by von Martens, Die 

 Hel., 1860, p. 37. 



Turrite, or cylindric below, varying from rib-striate to 

 ribbed, the last whorl swollen at the periphery, strongly car- 

 inate beneath, concave above the keel, which is serrate. Aper- 

 ture more or less angular at the outer and basal margins. 

 Apex costulate or smooth. Axis slender, straight, or with a 

 low spiral lamella. Radula with the cusp of the central tooth 

 much wider than the basal-plate ; ectocone of the inner lateral 

 born on a long, slender extension of the basal-plate. 



I. Mainland species, southeast Mexico to Trinidad, with 

 costulate or striate apical whorls, and a small axial 

 lamella; species 19 to 27. 



II. Caribbean species (including Curacao), with smooth 

 apical whorls, and straight or twisted axis ; species 28 

 to 31. 



III. Species of St. Croix and the Virgin Islands to Haiti, 

 with the apical whorls costulate, the axis straight or 

 nearly so; species 32 to 37. 



