154 MOLLUSCA OP THE GULF OF MFXICO 1 24 



5aza) watsoni Dall, Bull. Mus. Comp. Zool., 9, p. 50, '81; 

 18, p. 356, pi. 22, f. 7, 7a, pi. 23. f. I, la, pi. 24, f. 2, 2a. 

 1889. 



Margarita filosa Dall, Bull, M. C. Z., 9, p. 42, '81. 



Distribution. — Yucatan Strait, 640 fms. Also off Cuba and 

 Barbados. 



Genus LIOT!A Gray 



gemmia Tuomej^ and Holmes, Pleioc. Fos. S. Carolina, p. 118, 

 pi. 26,, f. 4, '56, (as Trochits) -^zyX and Simpson, Bull. U. S. 

 Fish Com., i, p. 445, 1901. 



tricarinata Stearns, Proc. Bost. Soc. Nat. Hist., p. 23, for '72; 

 {b.s Archilecto7iica); Dall, Bull. M. C. Z., 18, p. 389, '89; 

 Bull. 37, U. S. N. M., p. 166, '89. 



Distribution. — Hatteras to Porto Rico. Also off Tampa, 

 West Fla., 15 fms. Pliocene, Caloosaliatchie beds. 



bairdi Dall, Bull. M. C. Z.. i8, p. 389, pi. 33, f. 8, '89. 



Distribution — Gulf of Mexico, Blake Station 2, at 805 fms. 

 Also off Carolina, Key West and Havana. 



Genus CALLSOSTOiA Swainson 



euglyptum A. Adams, Proc. Zool. Soc, p. 38, '54, (3.S Zizyphimcs) ; 

 Reeve, Mon. Zizyp., pi. 3, f. 17, '63; Dall, Bull. M. C. Z., 

 18, p. 363, '89; Pilbry, Man., 11, p. 374, pi. 15, f. 37, pi. 

 57, f. 9, '89. 



Distribution. — North Carolina to Florida, Texas and Vera 

 Cruz, Mexico. Erroneously referred by Reeve to Tasmania. 

 3-32 fms. Pliocene ancestor is C. philanthropus Conrad. 



circumclnctum Dall, Bull. M. C. Z., 9, p. 44, '81; 18, p. 364, pi. 

 22, f. 3, 3a, '89; Bull. 37, U. S. N. M., p. 162, pi. 22, f. 3, 

 3a, '89. 



Distribution. — Florida Keys, Antilles and Yucatan Strait. 

 640-805 fms. 



