PROCEEDINGS OF THE UNITED STATES NATIONAL MUSEUM 



issued Sfj&Sfv yL G?|ot by & 



SMITHSONIAN INSTITUTION 



U S NATIONAL MUSEUM 



Vol. 93 Washington: 1943 No. 3161 



NEW MARINE MOLLUSKS FROM THE 

 ANTILLEAN REGION 



By Harald A. Rehder 



In the course of identifying specimens sent in by correspondents 

 of the United States National Museum, I have from time to time 

 recognized forms that could not be assigned to any known species. 

 While making these identifications I have also run across novelties 

 in our collection that seem important enough to warrant their 

 description at the present time. 



Sincere thanks are due Dr. Paul Bartsch for his ever-ready assist- 

 ance and to the following assiduous collectors whose interest and 

 patience have made this paper possible: Dr. B. R. Bales, of Circle- 

 ville, Ohio; Dr. T. Van Hyning, of Gainesville, Fla.; Maxwell Smith, 

 of Lantana, Fla. ; and Ted Bayer, of Gainesville, Fla. 



Genus COOPERELLA Carpenter, 1864 



COOPERELLA ATLANTICA, new species 



Plate 19, Figures 3-4 



Shell small, thin, inflated, broadly oval, ends bluntly rounded, 

 translucent whitish, smooth except for growth ridges; beaks slightly 

 anterior and prosogyrate. In the left valve there are three thin 

 divergent cardinal teeth, the central one bifid, while in the right valve 

 there are two thin divergent cardinals ; no laterals are present. Liga- 

 ment external, rather short and broad, posterior to the umbones. 

 Pallial sinus rather broad and reaching beyond the center of the 

 shell. 



187 

 491729 — 42 



