2 PROCEEDIjSTGS op the national, museum vol. 80 : art. 17 



by rather strong, sublamellar, retractively curved, riblike elements, 

 which join the outer peripheral flap in a series of slender buttresses. 

 In addition to this, the base is marked by fine, irregularly placed, 

 spiral lirations. The aperture is of irregular shape. The basal lip 

 is decidedly sigmoid, forming an even, concave curve from the flap 

 to the columella. The parietal wall is covered with a glazed callus, 

 while the outer lip is constituted by the continuation of the broad 

 parietal flap. 



r?/;?e.— U.S.N.M. No. 382689 measures: Altitude, 85 mm.; great- 

 est diameter, 144 mm. The topotype is entered as U.S.N.M. 

 No. 382690. 



Remarks. — U.S.N.M. No. 92922 contains four badly worn and 

 battered specimens dredged in 1885 by the United States Bureau of 

 Fisheries steamer Albatross at Station 2625 in 247 fathoms on gray 

 sand bottom; bottom temperature, 46° F. ; 75 miles south by east, 

 ^2 east off Cape Fear, N. C. These specimens in the past were 

 referred, probably on account of their poor condition, to Xenofhora 

 caribaea Petit, but they are in reality members of the present species. 



The present species differs from Xenophora caribaea Petit in being 

 much larger, less ornamented with borrowed shells, and much more 

 closely sculptured with much more overhanging whorls, but the 

 greatest distinguishing characteristics are in the basal portion of the 

 turn, which in X. caribaea has a spiral keel immediately within the 

 junction of the peripheral flap and in the basal wall, which is absent 

 in the present species. X. caribaea lacks the expanded riblets of the 

 base, which extend as buttresses on the flap in the present species. 



From Xenofliora conchyliophora Born, the only other Floridian 

 Xenophora, the present species differs by having the broad peripheral 

 flap, which is missing in X. conchyliopliora. Here, too, the base is 

 not umbilicated and entirely differently sculptured. 



U.S. GOVERNMENT PRINTING OFFICE: 1931 



