MOLLUSKS COLLECTED ON THE PRESIDENTIAL 

 CRUISE OF 1938 



By PAUL BARTSCH 

 Curator, Division of Mollusks, U. S. National Museum 



AND 



HARALD ALFRED REHDER 

 Assistant Curator, Division of Mollusks, U. S. National Museum 



(With Five Plates) 



During President Franklin D. Roosevelt's cruise in the Pacific and 

 Atlantic Oceans in 1938, on board the U.S.S. Houston, Dr. Waldo L. 

 Schmitt, Curator of the Division of Marine Invertebrates of the 

 LInited States National Museum, served as Naturalist. Among other 

 things he made collections of mollusks in many rarely visited places, 

 which resulted in the discovery of a new subgenus and a number of 

 new species and subspecies, which are here described. 



We also give a list of all the species collected, believing this to be of 

 especial interest, since little is known of the marine fauna of the places 

 in which they were obtained. 



A particularly interesting fact presented by these collections is the 

 Indo-Pacific relationship of the marine mollusks of Clipperton Island, 

 which suggests a drift fauna. 



TEREBRA (SUBULA) ROOSEVELTI, n. sp. 



Plate 1, fig. 6 



Shell of medium size, elongate-turrited ; ground color yellowish on 

 the early whorls, gradually passing into brilliant dark orange on the 

 middle turns, again paling on the last whorl. The last 5 whorls have 

 the part posterior to the groove marked by areas of blackish chestnut 

 brown, which are of varying length ; a little distance anterior to the 

 groove a line of dots of the same color of varying size and spacing is 

 present. The last whorl also has three rather broad, somewhat inter- 

 rupted zones of pale brown separated by narrow paler lines ; both of 

 these elements are of about equal width, the darker bands being about 

 two and one-half times as wide as the light lines. The first of these 

 pale brown bands is immediately above the periphery, the second is 



Smithsonian Miscellaneous Collections, Vol. 98, No. 10 



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