290 BULLETIN OF THE 



The other species of this group which belong to the fauna under consider- 

 ation are Amalthea antiquata Linne, which occurs in South Florida and so 

 southward; Amalthea effodiens Cpr., which from a typical specimen in the 

 Museum looks distinct from any of the others, and seems to be confined to the 

 Lesser Antilles ; and Amalthea barbata, vars. tuberculata Cpr. and costellata Cpr., 

 found with the last species, certainly varieties of each other, and probably both 

 bearing a varietal relation to A. barbata. They are, however, much coarser 

 and stronger than any genuine, barbata I have seen, are brown instead of white, 

 and less elevated in habit than barbata, so they may well be distinct, in which 

 case the name of costellata would better be retained for the species. Lastly, 

 there is Amalthea subrufa Lamarck, which I have from Key West in 50 fms., 

 sand and coral, living on dead shells and corals. It extends from this point 

 southward. The Piliscus (Allerya) Krebsii Morch is a Williamia, closely 

 related to W. Gussoni Costa, and belongs to the family Siphonariidce. It is 

 probably widely distributed on floating objects. 



Family XENOPHORID^. 



Genus XENOPHORA G. Fischer. 



Xenophora G. Fischer, Tableau Synopt. de Zoognosie, p. 113, Moscow, 1808. Type 

 X. conchylioplmra Born. 



Section XENOPHORA s. s. 



Xenophora conchyliophora Born. 



Trochus conc/tyliophorus Born, Index Mus. Cass., p 333. 

 Xenophora laevigata G. Fischer, op. at , p. 113, 1808. 



Habitat. West Indies generally, and northward to the vicinity of Cape 

 Hatteras, where it is found in 30-40 fms. The Blake obtained it at Stations 

 5, 10, and 12, in the southern part of the Gulf of Mexico, in 36-229 fms., ooze, 

 bottom temperature about 50°. F. The Fish Commission has dredged it, 

 living, in from 14 to 111 fms., mud, in the Gulf of Mexico and the Antilles, 

 as well as along the Carolina coast. 



This is the only identifiable species among those cited and described by 

 Fischer. Therefore, the typical section of the genus must be composed of 

 those species agreeing with it. Phorus Montfort is precisely synonymous. 



This species is easily recognized by its brown base, not umbilicated, or with 

 a mere chink in occasional young specimens, and the margin of the base not 

 produced into a thin lamina. It does not reach as deep water as X caribaa, 

 and generally carries a much heavier load. Stones, corals (sometimes even 

 alive), oysters, chamas, and worn remains of heavy gastropod shells, cover and 

 conceal its surface. This species reachea back to the Eocene, under various 



