141 MoLi^uscA OF THE Gulf of Mexico 109 



1889. Not nasuta Conrad, Fos. Med. Tert. Form., p. 38, 

 \'^'^2>'=-(^l<^bamiensis Lea, Eocene. Not nasuta Sowerby. 

 Proc. Z. S., p. 35, 18S3, which is a Recent, West Coast 

 Central American species. 



Distribution. — Hatteras to Haiti, 4-63 fms. Gulf coast. 

 West Fla. and Tex. 

 (Erodona) priscopsis Harris, Bull. Am. Pal., vol. i, No. 3, p. 94, 

 pi. 2, f. 5, 5 a, 1895 ; Ball, Tr. W. I. S. 3, p. 853, '98. 



Note. — The onh' member of the section Erodona Daudin {^Po- 

 tamom_ya Sow&rhy, 1835 ; Azara d' Orbignj", 1839), ever 

 found in the North American marine coastal Tertiary. 

 Type Mya labiata from South American estuaries. Up- 

 per Miocene, Galveston well at 2443-2448 feet (Harris). 

 (Bothrocorbula) radiatula Ball, Tr. W. I. S., 3, p. 851, pi. 36, f. 

 1-3, 1898. 



Bistribution. — Miocene of Oak Grove, Fla., and of the Bascom 

 well. Mobile, Ala., at 1241 feet. 



Genus PARAMYA Conrad 

 subovata Conrad, Fos. Med Tert., p. 65, pi. 36, f. 4, 1845, (as 

 Myalina); Proc. A. N. S., Phila., for i860, p. 232 ; Ball, 

 Bull. 37, U. S. N. M., p. 70, 1889 ; Tr. W. I. S., 3, 

 p. 861, 1898. 

 Bistribution. — North Carolina to Florida, 12-30 fms. Miocene 

 (of Va. and N. C.) to Recent. Gulf coast.— West Fla. 



Genus SAXICAVA Fleuriau 

 artica Linnseus, Syst. Nat., ed, XII, p. 113, 1767, (as Mya); 

 Ball, Bull. 37, U. S. N. M., p. 70, pi. 59, f- 13. 1889 ; Tr. 

 W. I. S., 3, p. 834, 1898; Johnson, Occ. Pa., B. S. N. 

 H., 7, p. 78, 1915. 

 rugosa Lamarck, 1818, Gould, 1870. For other synonyms 

 see Ball, 1898. 

 Bistribution. — Arctic Sea to Barbados, o-ioo fms. Miocene (of 

 Md., N. C. and N. J. ; to Recent. Gulf coast. — Recent : 

 West Fla. Pliocene : Caloosahatchie beds. 

 azaria Ball, Bull. M. C. Zool., 9, p. 116, 1881 ; 12. p. 317, pi. 4, 



