MUSEUM OF COMPARATIVE ZOOLOGY. 369 



Section EUTROCHUS A. Adams. 



Shell umbilicated. Type, T. javanicus, Lam. 



A few years ago, in discussing the faunae of the coasts of America, a nat- 

 uralist would have called attention to the large number of fine species of 

 Calliostoma found on the western coast, and the paucity of species on the east, 

 as a peculiar characteristic. 



Now, thanks to deep-sea researches, we know that there are probably as 

 many, and certainly as fine, species of Calliostoma on the eastern shores of 

 America as there are on the western, though unfortunately they are not quite 

 so accessible. 



The two oldest known forms from the West Indies labor under the pecu- 

 liar difficulty, either of having close relatives in the East Indies and being 

 confounded with them in the monographs, or of being erroneously assigned by 

 authors to the East Indian fauna from time immemorial. 



I find, for instance, Trochus jujubinus and T. javanicus assigned to the East 

 Indies by the usual books of reference, except old Chemnitz, (though not by all 

 writers,) and yet I have never been able to find an authentic specimen from a 

 definite East Indian locality. 



It is to be presumed that both these shells are West Indian solely, but it is 

 rather curious that this matter has not been more generally understood, and 

 settled. Unfortunately, I have not been able to consult Dr. Fischer's mono- 

 graph, but that in Martini and Chemnitz refers only to Java. I prefer on the 

 whole, considering the falsity of the first specific name, to use Reeve's name 

 of zonamestus for Trochus javanicus, of which I have a fine specimen from 

 St. Kitts. 



I have the pleasure of adding some of the finest species known to the already 

 rather long list of this group. 



Calliostoma (Eutrochus) jujubinum Gmelin. 



Trochus jumbinus Gmelin, Syst. Nat., p. 3570. Dillw. Cat., II. p. 762. 



Habitat. Station 2, in 805 fms., dead, and probably drifted. Coast of North 

 Carolina, in the warm water off shore, to Florida, Texas, and Yucatan, in 10-30 

 fms. Antilles, Cuba, Jamaica, St. Thomas, Carthagena, Virgin Islands, Ba- 

 hamas, St. Croix, U. S. Nat. Mus. Pliocene of the Caloosahatchie deposits, 

 southwest Florida, Dall. 



Var. tampaensis Conrad. Whorls flat above instead of excavated ; colors 

 clouded dark and light brown and white, instead of reddish; distal end of 

 pillar more prominent. (Florida and northward.) 



Var. Rawsoni Dall. Shell smaller, whorls excavated above, umbilicus 

 smaller, pillar thin, and tooth weak or absent ; color dark red or very dark 

 brown and red, with lunate white cloudings ; cone of shell more acute, nucleus 

 vol. xviii. 24 



