THE NAUTILUS. 53 



smooth. Aperture ovate, wide above, narrow below, peristome 

 reflected and chocolate-colored. Height of shell 1, width 



mm. 



" 



This new subspecies differs from the East Mexico S. strebdi 

 (Pfr. ) by having the periphery more angular; the parietal 

 lamella is more enlarged and prominent at the end, and it has 

 4f whorls, S. strebeli having a little over 5. S. salvini (Tris- 

 tram) is a higher shell with wider umbilicus." 



Found in beach drift of Lake Izabal near Jocolo. 



Types in the Academy coll. and in the writer's coll. 



ScHASICHEILA WALKERI 11. Sp. 



Shell globose conic, thin, imperforate, umbilical region de- 

 pressed; varies from brownish-yellow to a horn color, under the 

 light brown cuticle. Whorls four, convex, crossed by fine 

 irregular lines of growth and revolving microscopical striae 

 which begin on the otherwise smooth nucleus. The costae and 

 striae are visible under a glass on removal of the cuticle. Aper- 

 ture subcircular, obtusely angular above with a slight, wide 

 sinus at the base; a callus extends from the columella across 

 the parietal wall to a slight notch at the suture. Operculum 

 missing. 



Shell measures: height 6, width 6.5 mm. Aperture, length 4, 

 width 2.5 mm. 



Found at a bluff on the mountain north of Chama, Alta 

 Verapaz, Guatemala. 



Named in honor of Dr. Bryant Walker, who is doing good 

 work for the advancement of malacology. Type in collection 

 of the Academy of Natural Science, cotypes in coll. B. Walker 

 and the writer. 



AMPULLARIA LATTREI CHAMANA n. subsp. 



A small, rather solid, short-spired race, with many bands of 

 ecru-olive on a ground of deep colonial buff. The interior 

 chocolate with some light bands above, lip with a broad chamois 

 or pale yellow border without bands. 



The aperture is narrower than in A. lemniscata Crosse & 

 Fischer, which appears to be nearly related. The surface is not 



