ART. 1. TERTIARY MOLLUSKS FROM THE WEST INDIES WOODRING. 3 



ornatus Gabb,^ collected by Gabb at an unknown locality in the 

 Dominican Republic. The age of the beds from which this species 

 came was not known until 1919, when D. D. Condit, then of the 

 United States Geological Survey, during a geologic reconnaissance 

 of the Dominican Republic under the direction of T. W. Vaughan, 

 collected it from the Baitoa formation at the type locality of the 

 formation on Rio Yaque del Norte at Baitoa. The known Baitoa 

 moUuscan fauna numbers about 60 species and is clearly of lower 

 Miocene (Burdigalian) age.® The type of O. inornatus has recently 

 been redescribed by Pilsbry.'^ 



The genotype was discovered also in beds of upper Oligocene age 

 in Florida.* The following four additional species have been de- 

 scribed: 0. 'pugnax (Heilprin) from beds of middle Oligocene age in 

 Georgia " and the island of Antigua,^" and from beds of upper Oligo- 

 cene age in Florida ; ^^ O. gabhi Dall, from beds of upper Oligocene 

 age in the Panama Canal Zone,^^ and from beds of lower Miocene 

 age in Florida ^^ and Porto Rico " (identification doubtful) ; 0. 

 aguadillensis Maury, from beds of upper Oligocene age in Porto 

 Rico,^" Anguilla ^® (identification doubtful), St. Croix,^^ and the 

 Dominican Republic,^* and from beds of lower Miocene age in the 



B Acad. Nat. Sci. Philadelphia, Proc, vol. 24, p. 272, pi. 9, figs. 3, 4, 1872. 



« See Vaughan, T. W., and W. 1*. Woodring, Chap. 4, Tertiary and Quaternary strati- 

 graphic paleontology : A geological reconnaissance of the Dominion Republic. Dominican 

 Rep. Geol. Survey Mem., vol. 1, p. 9G. 1021. 



'Pilsbry, H. A., Acad. Nat. Sci. Philadelphia Proc, vol. 73, p. 368, pi. 30, figs. 13-15. 

 1922. 



«Dall, W. H., U. S. Nat. Mus. Bull. 90, p. 86, pi. 11, fig. 4, 1915; Dall, W. H., U. S. 

 Nat. Mus. Proc, vol. 51, p. 509, pi. 88, fig. 9, 1916; Cooke, C. W., U. S. Geol. Survey 

 Prof. Paper 129-B, pp. 25, 28, pi. 2, fig. 4, 1921. 



» Dall, W. H., U. S. Nat. Mus. Proc, vol. 51, p. 509, 1916 (also as O. inornatus on 

 same page) ; Cooke, C. W., U. S. Geol. Survey Prof. Paper 129-B, pp. 25, 29, pi. 3, fig. 2, 

 1921. 



See p. 2 for hitherto unpublished localities in Alabama and Florida. 



'"Cooke, C. W., Carnegie Inst. Washington Pub. 291, p. 115, pi. 2, fig. 4, 1919; Cooke, 

 C. W., U. S. Geol. Survey Prof. Paper 129-B, pp. 25, 29, pi. 3, figs. 3a, 35, 1921. 



11 Heilprin, A., Wagner Free Inst. Sci. Trans., vol. 1, p. 107, pi. 15, figs. 36, 36a, 1887 ; 

 Dall, W. H., Wagner Free Inst. Sci. Trans., vol. 3, p. 170, pi. 8, figs. 5, 8, 1890. Dall, 

 W. H., U. S. Nat. Mus. Bull. 90, p. 87, pi. 15, figs. 5, 10, 19l5 ; Cooke, C. W., U. S. Geol. 

 Survey Prof. Paper 129-B, pp. 2y, 29, pi. 3, figs, la, 16, 4a, 46, 1921. 



^ Cooke, C. W., in T. W. Vaughan, U. S. Nat. Mus. Bull. 103, p. 550, 1919 (as 0. 

 pugnax) ; Cooke, C. W., U. S. Geol. Survey Prof. Paper 129-B, pp. 25, 30, 1921. 



" Dall, W. H., Wagner Free Inst. Sci. Trans., vol. 3, p. 170, pi. 12, figs. 5, 5a, 56, 1890 ; 

 Cooke, C. W., U. S. Geol. Survey Prof. Paper 129-B, pp. 25, 30, pi. 3, figs. 5-7 ; pi. 4, fig. 

 1, 1921. 



" Hubbard, B., Scientific Survey of Porto Rico and the Virgin Islands, vol. 3, pt. 2, p. 

 145, pi. 23, fig. 3, New York Acad. Sci., 1921. 



IB Maury, C. J., Scientific Survey of Porto Rico and the Virgin Islands, vol. 3, pt. 1, p. 

 58, pi. 9, fig. 4, New York Acad. Sci., 1920 ; Cooke, C. W., U. S. Geol. Survey Prof. Paper 

 129-B, pp. 25, 31, pi. 4, fig. 2, 1921. 



" Cooke, C. W., Carnegie Inst. Washington Pub. 291, p. 115, pi. 2, fig. 3, 1919 (as O. 

 pugnax) ; Cooke, C. W., U. S. Geol. Survey Prof. Paper 129-B, pp. 25, 31, pi. 4, fig. 3, 

 1921. 



" Cooke, C. W., U. S. Geol. Survey Prof. Paper 129-B, pp. 25. 31, pi. 4, fig. 4, 1921. 



*^ Idem. 



20183— 25— Proc. N. M. vol. 64 2 



