396 PROCEEDINGS OF THE ACADEMY OF [1899. 



Alt. 52, cliam. 18, length of aperture 24 mm. 



Alt. 45, diam. 16^, length of aperture 23 mm. 



Alt. 42, diam. 14, length of aperture 21J mm. 



Diente, near Monterey, State of Nuevo Leon, Mexico. 



The last measurements are of a specimen not quite mature, with 

 7^ whorls. 



It is somewhat like G. longula or G. sing/eyana, but lacks any 

 trace of spiral striation; the suture is only weakly crenulated, and 

 not marginate. It is smoother than G. liebmanni and G. aude- 

 barcU, especially at the sutures, and is of a more slender form. 



Glandina dalli u. sp. 



Shell thin, slender, turreted and slowly tapering above, broadest 

 near the base, which is rather " saccate." Brownish corneous, 

 slightly translucent, smooth and glossy throughout, except for 

 rather separated, very short impressed grooves below the sutures 

 forming a series of very short, low, broad folds there; and there 

 are a few impressed, sinuous, longitudinal grooves, reminiscent of 

 former peristomes, on the last whorl or two. Spire long, with 

 very slightly convex lateral outlines and quite obtuse apex. 

 Whorls S^, slightly convex, the last one compressed laterally and 

 decidedly full below. Aperture small, very narrow above, broad 

 and slightly squarish below, the outer lip thin, vertical, bent 

 forward in the middle, strongly retracted below, giving the basal 

 lip an effuse aspect. Columella slwrt, strongly concave and con- 

 spicuously truncated below. 



Alt. 20, diam. 6.2, length of aperture 9.5 mm. 



Alt. 18, diam. 6.3, length of aperture 9.5 mm. 



Alt. 19, diam. 6.2, length of aperture 9.8 mm. 



Diente, near Monterey, State of Nuevo Leon, Mexico. 



Glandina dalli belongs to a small group of Mexican species of 

 small size and smooth, glossy surface, but seems abundantly distinct 

 from any hitherto described. Compared with G. bellula C. and 

 F., this species differs in being of narrower form, with longer, 

 narrower aperture, the posterior portion of which is more pro- 

 longed and much narrower; also in the comparatively simple 

 suture. It is more lengthened than G. oblonga Pfr,, and less 

 plaited at the sutures. G. ambigua Pfr. is stouter in form; and G. 

 conularisVtr. has a wider aperture and far more arcuate outer lip. 



