76 BRACK YPODELLA, S. STR. 



Cyl. trinitaria PFR., Malak. Bl., vii, 1860, p. 213, pi. 2, f. 

 4-7; Monogr., vi, p. 388. GUPPY, Ann. & Mag. N. H. (3), 

 xvii, p. 52; P. Z. S., 1875, p. 320; Journ. of Conch., i, p. 109; 

 Journ. of Conch., vii, p. 219; Trans. Linn. Soc., xxvi, pi. 11, 

 f. 12 (teeth, bad) .GIBBONS, Journ. of Conch., ii, 1879, p. 131 

 (varieties and habitat). BLAND, Amer. Journ. of Conch., iv, 

 p. 186, fig. of teeth and jaw in text,, FISCHER, Journ. de 

 Conchyl., 1870, pp. 9, 10 (jaw and teeth). CROSSE, J. de C., 

 1890, p. 43. 



Related by its spiral axis and the long spire of numerous 

 whorls to the mainland species, not to those of the, Antilles. 

 The whorls are decidedly more convex than in the Venezuelan 

 species. Probably Guppy's statement that trinitaria occurs 

 at Carupano, Venezuela, was based upon the specimens of B. 

 leucopleura. 



The species was first collected by Prof. Theodore Gill, and 

 reached Pfeiffer through Bland and Poey. These typical 

 specimens, some of which are before me, are from 13 to 15 

 mm. long, with 15 to 17 whorls. The rest of the shells before 

 me are separable into two lots, ( 1 ) larger shells, entire or with 

 many whorls remaining, as in the last two measurements 

 given above, and (2) smaller shells, first two measurements 

 above, with fewer whorls remaining, about seven usually lost 

 by adult shells, judging by the broken-off tips among the 

 specimens. This small form was collected by both Gill and 

 Guppy. There does not seem to be intergradation of the three 

 sizes in the series of about 60 shells from all sources before 

 me ; they are probably local sub-races. Figs. 38, 39 are copies 

 of the 'type figures. Fig. 37 is a typical specimen. The vari- 

 ations of B. trinitaria have been already commented on by 

 Gibbons, who however seems to have included B. lianleyana 

 or B. leucopleura. 



Group of B. antiperversa: Caribees, Curacao. 

 Small forms, usually with 7% to 12 whorls in truncate, 14 

 to 18 in entire shells, the last but shortly or not free. Two or 

 three apical whorls smooth, the first one decidedly elevated. 

 Axis straight or a little twisted. 



