THE NAUTILUS. 53 
smooth. Aperture ovate, wide above, narrow below, peristome 
reflected and chocolate-colored. Height of shell 14, width 
44 mm. 
‘‘ This new subspecies differs from the East Mexico S. strebeli 
(Pir.) by having the periphery more angular; the parietal 
lamella is more enlarged and prominent at the end, and it has 
43 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 N. 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 6.5mm. Aperture, length 4, 
width 2.5 mm. 
Found at a bluff on the mountain north of Cham4, 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 
