66 HELIX-THELIDOMUS. 



the peristome ; aperture extremely oblique, truncate-oval, rather 

 small ; peristome a trifle expanded, thickened within, white, heavy, 

 upper and outer margins arcuate, baso-columellar margin straight, 

 contracted by a white plate-like callus within, the upper edge of 

 which is slightly calloused near the insertion, and decidedly trun- 

 cate at its junction with the outer lip. 



Alt. 21, diam. maj., 34, min. 26-27 mill. 



Guantanamo, etc., Eastern Cuba, 



H. guantanamensis POEY, Memorias, ii, p. 27, t. 3, f. 8, 9. (1856.) 

 PFR., Novit. Conch., p. 186, t. 50, f. 7-9. H. proboscidea PFR., 

 Malalc. BL, 1856, p. 44. and Novit. Conch., p. 204, t. 54, f. 1-3. (H. 

 porcina Gutierrez mss. teste Pfr.) 



I do not know which of the two names given in the above syn- 

 onymy has priority ; both were published in 1856. The species may 

 be separated from H. bayamensis by the differences indicated under 

 that species. The more prominent characters of this form are the 

 transversely dilated shape of the last whorl, which is compressed for 

 its first half, its latter half quite full and dilated ; the fine, regular 

 sculpture, continued upon the base almost to the center ; and the 

 truncate callus of the lower margin of the aperture. There is a 

 small form which measures only about 25 mill. diam. The above 

 remarks apply to the typical form ; the following seems to be merely 

 a variety. 



Var. PROBOSCIDEA Pfeiffer. PI. 2, figs. 10-12 ; pi. 1, figs. 10-13. 



Smoother than the type, finely striate; last whorl very much 

 dilated transversely ; aperture bubhbrizontal, the basal margin with 

 a heavier plate of callus within than the typical guantanamensis. 



Alt. 20, diam. maj. 35, min. 28 mill. 



H. RANGELINA Pfeiffer. PL 2, figs. 4-6 ; pi. 32, figs. 56, 57. 



Imperforate, depressed conoidal, solid, yellowish straw-colored, 

 finely, regularly, costulate-striate, striae simple, smooth, not bifurcat- 

 ing, the base smoother, glossy ; spire low-conical, apex obtuse, first 

 1? or 2 whorls smooth, whitish ; sutures impressed ; body- whorl con- 

 vex, transversely dilated, rather tumid beneath on its latter half, 

 deeply deflexed anteriorly ; aperture subhorizontal, truncate-oval, 

 rather small ; peristome expanded, not brown outside, much thick- 

 ened within and on its face ; baso-columellar margin horizontal^ 

 very broad, contracting the aperture by a plate-like callus within, 

 which in fully adult individuals bears an inflected emargination or 



