242 HEMITROCHUS. 



having a supraperipheral chestnut zone and numerous bands of a 

 lighter brown both above and below, all bands sometimes lacking. 

 Whorls 4, convex, the first smooth ; sutures impressed ; last whorl 

 rounded at the periphery, deeply descending in front. Aperture 

 transversely oval, oblique ; outer lip slightly expanded, slightly 

 thickened within ; baso-columellar lip reflexed, nearly straight, the 

 columella thickened by a strong callus within, which is more or less 

 truncated below. 



Alt. 7*, greater diam. 121, lesser 11 mill. 



Bahamas. 



H. (Plagioptycha) maynardi PILS., Nautilus, Nov., 1891, p. 83; 

 Proc. A. N. S. Phila., 1891, p. 456. 



This is one of those species lying somewhat between Plagioptycha 

 and Hemitrochus. It resembles the form described by me as If. 

 brownii in the surface-sculpture, which is decidedly coarse, as 

 in H. albersi. The brown bands of the surface are visible on the 

 face of the thickened and slightly expanded lip, but they are some- 

 times absent. 



H. XANTHOPHAES Pilsbry. PI. 57, figs. 20, 21, 22. 



Shell small, subglobose, solid, narrowly rimate. Spire low-conoid, 

 the apex obtuse. Surface shining, having irregular growth-lines 

 more conspicuous just below the suture. Streaked with reddish- 

 chestnut on a pale isabelline ground, having an inconspicuous paler 

 line at the periphery and a dark band just above it, the latter some- 

 times obsolete. Whorls 4, separated by slightly impressed sutures, 

 the last whorl very obtusely subangular at the periphery, slightly 

 descending in front. 



Aperture half-round, oblique ; peristome not in the least reflected, 

 thickened and pinkish within, showing the band when present. 

 Columella steeply sloping, straight, forming an obtuse angle with the 

 basal margin ; its upper two-thirds flatly reflexed to form a triangular 

 plate nearly concealing the umbilicus. 



Alt. 6i, greater diam. 8, lesser 1\ mill. 



Alt. 10, greater diam. 11* mill. 



Inagua, Bahamas. 



Helix (Hemitrochus) xanthophaes PILSBRY, Nautilus, Nov. 1891, 

 p. 83; Proc. A. N. S. Phila. 1891, p. 456. 



This is the smallest species yet known of the Hemitrochus group 

 of Helices. It has the same general coloring as the var. of H. vari- 



