gi MOLLU.SCA OF THE GuLF OF MEXICO 59 



divayicata Lamarck, An. s. Vert., 5, p. 541. 1818, (as L71- 

 d7ia, in part). Not of Linnaeus. Tuomey and Holmes, 

 Pleio. Fos. C. p. 59, pi. 17, f. lo-ii, '57 ; Holmes, Post- 

 Pi. Fos. S. C, p. 27, pi. 6, f. I, '60. 

 conra d i d'Orhigny, '52, strigilla, Stimpson, '51, ameiicana 

 Adams, '52, not Defrance, 1823, (alias Lucina). 



This species has often been confused with the Mediterranean 

 shell, D. divaricata Linnaeus, and with the larger, recent 

 American .species, D. dentata Wood. 



Distribution. — Nantucket Island to Rio de Janeiro, 10-50 fms. 

 Miocene (Md. and Va.) to Recent. Gulf coast. — Recent. 

 Ft. Barranca and Crooked Isl., Fla. Pleistocene : Teel 

 No. I well, Saratoga, Tex., at 940 feet. Upper Miocene. 

 Galveston well at 2552-2600 feet. (Harris, as dentata). 

 chipolana Dall, Tr. W. I., 3, p. 1389, pi. 51, f. 2, 1903. 



Distribution. — Miocene of the Chipola marl and Oak Grove 

 sands, Florida ; and of the Bascom No. i well, Mobile, 

 Ala., at 1500-1556 feet, Bascom No. 2 well, 1241 and 1600 

 feet. 



Genus DiPLODONTA Bronn 

 punctata Say, Jour. Acad. Nat. Sci. Phila., 2, p. 308, 1822, (as 

 Amphidesma); Dall, Tr. W. I. S., 3, p. 1187, 1900; Proc. 

 U. S. N. M., 23, p. 793, '01 ; Vanatta. Proc. A. N. S. 

 Phila., 55, p. 757, '03. 

 stibglobosa C. B. Adams, Proc. Bo.st. Soc. Nat. Hist. 2, p. 

 298, '47, {novicn nudem); Dall, Bull. 37, U. S. N. M., p. 



52, '89. 

 venezuelensis Dunker, Zeit., Mai., 5, p. 184, '48,(as Z/cr?>/a ); 

 Novit. Conch. Moll. Mar., p. 3, pi. 4, f. 7-9. '58 ; Dall, 

 ' B. M. C. Z., 9, p. 136, '81. 

 janeirensis Reeve, Conch. Icon., Ltichia, pi .8, f. 43, '5'^x{'Ts 



Lucina). 

 braziliensis Mittre, Jour, de Conchy., i, p. 240, pi. 12, f. 7- 



9, '50. CNot braziliensis Philippi). 

 Mysia pellucidaYi&i\\>x\\\,'T\^^ Bermuda Isls. , pp. 179, 190, 

 pi. 17, f. 3, '89. 



