BRACHYPODELLA, JAMAICAN. 99 



long, quadrangular neck, pinched into very strongly project- 

 ing basal and peripheral keels, strongly angular above, and 

 obtusely so on the columellar or concave side of the neck. 

 Aperture vertical, rounded, angular and channelled within at 

 the outer and basal margins, the lip white, broadly and flatly 

 reflexed. Axis slender in the upper whorls, at first simple, 

 then encircled with two low spiral cords in the upper third of 

 the shell's length; then growing thicker, cylindric, usually 



* 



with two or three additional low spirals, which become weak 

 or disappear in the lower half, where the axis is stout, a little 

 thickened at the ends in each whorl, and grooved along the 

 partitions. 



Length 40y 2 , diam. 4 mm., whorls 21. 



Length 36, diam. 4 mm., whorls 19-20 (typical size). 



Length 30, diam. 4 mm., whorls 16y 2 (White River). 



Length 26, diam. 3.8 mm., whorls 15y 2 (White River). 



Jamaica: Yallahs hills, at about 2,000 ft. elevation; abun- 

 dant at the source of the White River (Jarvis). Map p. 88, 

 area 2. 



Cyl. agnesiaiia C. B. A., Contrib. to Conch., no. 2, p. 19 

 (Oct., 1845). BLAND, Ann. Lye. N. H. of N. Y., vi, p. 151, 

 pi. 5, f. 16 (axis). PFR., Monogr., iii, p. 575; Conchyl. Cab., 

 p. 58, pi. 6, f . 26, 27 ; Malak. Bl., xxiii, 1876, p. 216. FISCHER, 

 Journ. de Conchyl., 1870, pp. 11, 25, pi. 3, f. 7, 8 ( teeth) .- 

 SOWERBY, C. Icon., xx, pi. 5, f. 43. GLOYNE, J. de C., 1872, 

 p. 36; Quart, Journ. of Conch., i, p. 53 (food, viviparity) .- 

 .Brfl<:/^;^/pO/da agnesiana Ad., PILS. & VAN., Proc. A. N. S. 

 Phila., 1898, p. 279, pi. 18, f. 19 (axis). 



The largest species of the group, truncate shells, varying 

 from 25 to 42 mm. long. A small entire specimen examined 

 by Adams had 28 whorls, Avith a length of 41 mm. Mr. Jarvis 

 found it in profusion at the source of the White River, in the 

 Yallahs hills, on limestone rocks. He remarks that it does not 

 seem to be widely distributed in these hills. Gloyne gives the 

 localities Yallahs and Orange Park, but I do not know whether 

 he refers to the small or the typical large form. 



From the dimensions given above, the size diminishes to 

 half the greatest length of the species. Shells similar to the 



