MOLLUSCA OF THE GuLF OF MEXICO 59 



divaiicata Lamarck, An. s. Vert., 5, p. 541, 1818, (as Lu- 

 cina, in part). Not of Linnaeus. Tuome3^ 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. 

 conradi d'Orbign}^ '52, strigilla, Stimpson, '51, ameiicana 

 Adams, '52, not Defrance, 1823, {2S\. z.s 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 

 A?nphidesma); 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. Bost. Soc. Nat. Hist. 2, p. 

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



52, '89. 

 veneziielensis Dunker, Zeit., Mai., 5, p, 184, '48, (asZ,Z('<:7';^«) ; 



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



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

 Janeirensis 'R.e^we, Conch. Icon., Licdna, pi .8, f. 43, '50, (as 



Lucina). 

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



9, '50. fNot braziliensis Philippi). 

 Mysia pellucida Heilprin, The Bermuda Isls., pp. 179, 190, 



pi. 17, f. 3, '89. 



