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NEW MARINE MOLLUSKS 



By LOIS F. COREA 



Student Assistant, The George Washington University 



(With Three Plates) 



Among other Turritid mollusks obtained by the First Johnson- 

 Smithsonian Deep-Sea Expedition to the Puerto Rican Deep is a small 

 well-defined group consisting of six species, only one of which has been 

 previously described, namely, Drillia interpleura Dall and Simpson/ 

 This group appears to be unnamed and is here given the name 

 Buchema, a new subgenus of Carinodrillia Dall. The five new species, 

 the names of which have been derived from Puerto Rican mythology, 

 are here described and figured. 



I wish here to express my appreciation to the authorities of the 

 United States National Museum for having extended to me the use 

 of laboratory facilities and collections in making this study and the 

 necessary comparative work. I am especially indebted to Dr. Paul 

 Bartsch, Curator of the Division of Mollusks and Cenozoic Inverte- 

 brates, United States National Museum, for many helpful sugges- 

 tions, and to Mrs. Aime Awl, United States National Museum, for 

 retouching the photographs. 



BUCHEMA, n. subgen. 



The present paper deals with a group of moderate-sized, rather 

 heavy shelled mollusks which resemble the members of the genus 

 Carinodrillia Dall,^ of which Carinodrillia halis, Dall, is the type. 

 They differ from Carinodrillia in having the nuclear whorls without a 

 median carina. Here they are rounded, the early whorls smooth, suc- 

 ceeded by a finely axially, closely lirate portion that passes into an 

 axially slender ribbed part, which in turn passes into the postnuclear 

 sculpture. The sculpture of the postnuclear whorls consists of strong 



^ Dall, William Healey, and Simpson, Charles Torrey. The mollusca of Porto 

 Rico. Bull. U.S. Fish Commission, vol. 20, for 1900, ist pt., p. 386, pi. 57, fig. 21, 

 1902. 



'Proc. U.S. Nat. Mus., vol. 56, p. 17, 1919. 



Smithsonian Miscellaneous Collections, Vol. 91^ No. 16 



