430 PROCEEDINGS OF THE NATIONAL MUSEUM VoL. 118 
Drymaeus rehderi, from Colombia 
Drymaeus megastomus, from Costa Rica 
Drymaeus waldoschmiiti, from Peru 
Drymaeus poecilus tricinctus, from Bolivia 
Protogiyptus minutissimus, from Bolivia 
Odontostomus fasciatus tenuisculptus, from Colombia 
One new name, Plekocheilus ameghinoi, is proposed for a species 
from Colombia bearing a homonymous name. 
In the discussions of each species, specimens from other museums 
are indicated by their initials: Museum of Comparative Zoology at 
Harvard University (MCZ), Carnegie Museum, Pittsburgh (CM), 
Museo Argentino de Ciencias Naturales, Buenos Aires (MACN). 
The author wishes to express his appreciation to those persons who 
helped make this study possible: Dr. Waldo L. Schmitt, formerly 
Head Curator of Zoology at the U.S. National Museum, and Dr. 
Harald A. Rehder and all the members of the Division of Mollusks 
of the same museum for the extensive facilities placed at my disposal; 
Dr. Fritz Haas, Curator Emeritus, Division of Lower Invertebrates, 
Chicago Museum of Natural History, Dr. William J. Clench, Curator, 
Department of Mollusks, Museum of Comparative Zoology, and Dr. 
Joseph P. Bequaert, for their friendly and valuable suggestions. 
Subfamily Bulimulinae 
Genus Bulimulus Leach, 1815 
Bulimulus corderoi, new species 
PLATE 2, Figure 15 
Shell rimate, thin, diaphanous, elongated, diameter less than half of 
the length; 5% whorls, little convex; spire short in proportion to the 
last whorl which is longer than two-thirds of the height; penultimate 
whorl less than half of the spire. Suture regularly impressed. Color 
whitish, clearer at the sutures, rarely with very pale brownish stripes. 
Surface not polished and without any particular sculpture except some 
occasional very fine, microscopical incisions, and the very irregular 
lines of growth. Aperture oval elongate, almost half of the total 
length of the shell, with peristome very thin and the umbilicus covered 
in part by the columellar margin of the lip. 
Holotype (USNM 348777) collected by H. M. Smith at La Coro- 
nilla, northeast coast of Uruguay, July 12, 1922. It measures: 
Height 22 mm., diameter 10.5 mm., last whorl 16 mm., aperture 
10.4x6 mm. Nine paratypes. There is another separated paratype 
(young) under a different number (USNM 527653). 
