BUI.I.BTTN 39 



3i8 



intermediate cord, to more delicately sculptured foi-ms with finer 

 tuberculated cords separated b}^ wide and finely sculptured inter- 

 spaces. 



This species occur also in the Bowden beds of Jamaica and 

 in the Gurabo formation of Santo Domingo. 



Gatun Stage: Hill i, 2, Banana River. 



Genus PETALOCONCKUS H. B. Lea 



Petaloconchus SOUipturatus, H. C. Lea Plate 14, figures 10, 15 



Petaloconchiis sciilpturatus H. C. Lea, 1845, Trans. Amer. Phil. Soc, 

 vol. 9, p. 233, pi. 34, fig. 3. 



Petaloconchiis doniingensis Sowerby, 1849, Qi^art. Journ. Geol, Soc. 

 London, vol. 5, p. 51, pi. 10, fig. 8, a b c. 



PatalocoiicJius sculpturatus Gabb, 1875, Trans. Amer. Phil. Soc., vol. 

 25, p. 240. 



Pataloconchus sculpturatus On-^^^y , 1876, Quart. Journ. Geol. Soc. Lon- 

 don, vol. 32, p. 519. 

 Vermetus {Petaloconchus) sculpturatus Dall, 1892, Trans. Wagner 

 Free Inst. Sci., vol. 3, pt. 2, p. 305. 



Vermetus {Petalocouckus) pulcherBose, 1906, Bol. Inst. Geol. de Mex- 

 ico, Numero 22, p. 32, pi. 3, figs. 22, 23. 



PetaLoco?ichus domingensis Brown and Pilsbry, 191 1, Proc. Acad. Nat, 



Sci, Phila., vol. 63, p. 359. 

 Petaloconchus domingensis Pilsbry and Brown, 1917, Proc. Acad. Nat. 



Sci. Phila., vol. 69, p. 37. 

 Petaloconchus domingensis Maury, 1917, Pull. Amer. Pal., vol., 5, p. 



292, pi, 22, fig. II. 

 Pataloconchus domingensis Hubbard, 1920, New York Academy of 



Science, Sci. Sur. P. R., vol. 3, pt, 2, p. 139. 



The Antillean fossil was described by Sowerby as domingen- 

 sis. It has been b}^ some writers, considered synonymous with 

 sculpturata^ described a few years earlier by H. C. Lea from the 

 Chesapeake Miocene of the eastern United States, while others 

 have given doiningejisis the rank of a full species. A close com- 

 parative study of the Costa Rica fossils with several sets of typi- 



