A NEW MARINE SHELL OF THE GENUS XENOPHORA 



FROM FLORIDA 



By Paul Bartscii 



Curator, Division of Molltisks and Cenozoic Invertehrates 

 United States National Museum 



During the summer of 1931, Dr. William H, Longley, executive 

 officer of the Marine Biological Laboratory of the Carnegie Insti- 

 tution at the Tortugas, Fla., made a number of deep-sea dredge hauls 

 south of Loggerhead Key. In one of these hauls two large living 

 Xenofliora were obtained in 98 to 125 fathoms of water, which prove 

 to belong to an undescribed species, which I take pleasure in naming 

 for Doctor Longley. 



XENOPHORA LONGLEYI. new species 



Plate 1 



Shell unusually large for the genus. The type has about 8 

 whorls; as the apex is somewhat fractured, the exact number is 

 slightly in doubt. The shell is of grayish- white coloration. The 

 whorls are broadly conic and overhanging, particularly so in the 

 later turns, where, for example, in the last whorl a very broad 

 peripheral fold extends obliquely outward. The basal portion of 

 the turns is more or less ornamented with fragments of attached 

 shells, in this instance rather less so than is usual in the genus. 

 The actual sculpture on the upper side of the turns consists of 

 retractively curved, irregular, incremental lines, which lend a some- 

 what wavy appearance to the shell. There are also wavy, closely 

 spaced, fine, threadlike elements placed at right angles to the incre- 

 mental lines, which give to the surface a decidedly ripple-marked 

 effect. The periphery of the last whorl has a decided curtainlike 

 flap, to which I have alluded above. The basal side of this flap is 

 smooth and porcelaneous white, while the rest of the base has a 

 reddish tinge, but here and there it shows an indication of the 

 incremental lines. The base of the shell is moderately openly 

 umbilicated. The basal wall is moderately convex and is marked 



No. 2917.— Proceedings U. S. National Museum, Vol. 80, Art. 17 



82798—31 1 



