i6o M01.LUSCA OF THE Gulf of Mexico 130 



Distribution. — Tampa, West Fla., in shallow water, to 

 Jamaica, 



Genus CSRCULUS Jeffreys 



Isratus Verrill, Tr. Conn. Acad. Sci., 5, p. 529, '82, {Omalaxis)\ 

 6, p. 452, '85, (Skenea); Bush. op. ciL, 6, p. 464, '85; Bull. 

 M. C. Z., 23, p. 240, pi. I, II, 12, '93; Tr. Conn. Acad, 

 Sci., 10, p. 125, pi. 23, f. 7, i2-i2b, '99-1900. 



Adeorbis supranitidiis var. orbignyi Dall, Bull. M. C. Z., 18, p. 

 278, '89; (in part); Tr. W. I. S., 3, p. 344, '92; Johnson, 

 Occ. Pa. Bost. Soc. N. H., 7, p. 120, 1915; Not orbignyi 

 Fischer, Journ. de Conch., 6, pp. 173, 286, '57. 



Distribution. — New England to Hatteras and West Florida. 

 Lower Miocene, Chipola beds. West Fla. 



Note. — The true Circulus orbigiiyi Fisher is West Indian and 

 ver}^ minute, only i^^ mm. in diameter, while liratus is 2^ 

 mm. in diameter. 



tri!ix Bush, Rept. U. S. Fish Com., for 1883, p. 584, 1885, (as 

 Skenea); Tr. Conn. Acad. Sci., 10, p. 127, pi. 22, f. 6, 10, 

 loa, 12, a-g, pi. 23, f. 10, 15, 1899-1900. 



Adeorbis supranitidus Dall, Bull. M. C. Z., 18, p. 278, '89; 

 Bull. 37, U. S. N. M., p. 150, pi. 41, f. 7, 7a, '89, (in 

 part). Not supranitidus Wood, Cat. 1842, Crag. Moll., p. 

 137, pi. 15, f. 5a-b, 1848. 



Distribution. — Massachussetts to Hatteras and to Cedar 

 Keys, West Fla. 15-25 fms. Pleistocene, Knapp's No. 2 

 well, Terrebonne Parish, La., at 15 19- 1632 feet. 



Genus LSSSOSPIRA Bush 



proxima Trj^on, Manual Conch., 10, p. 98, pi. 33, f. 4, 1888, 

 (^Cyclostref}ta)\ ^xx.'^h.^ Tr. Conn. Acad. Sci., 10, p. 130, f. 4, 

 pi 22, f. 3, 1899-igoo. 



rugulosumN^xx\W, Tr. Conn. Acad. ,5, p. ^2 XCyclostrema) . 

 Not of G. O. Sars, 1878. 



