58 Bulletin 39 230 



ing those on the anterior canal; aperture elliptical with a thin 

 outer lip and long twisted anterior canal. 



Length 23.5, diameter 7, last whorl 15 mm. 



The small exposure of Gatun shales, on the east shore of 

 Columbus Island, about one mile north of the city of Bocas del 

 Toro, has yielded a large number of small interesting gastropods. 

 iVIore than a dozen species of Pleurotomids were collected at this 

 place by Mr. R. A. Terry and the writer during a short period 

 of collecting. 



The T. taurina, also from this localit_v, is somewhat similiar 

 but differs by its more convex whorls, deeper fascicle and prati- 

 calh^ lacks all axial sculpturing. 



Gatun Stage: Bocas del Toro, Panama. 



Genus TURRJS Bolton 



Turris albida Perry Plate 4, figres i, 2 



Pleurotoma albida Perry, 181 1, Conch. Expl., pi. 32, fig. 4. 

 Plemotoma virgo Lamarck, 1822, An. s. Vert., vol. 7, p. 94. 

 PletLrotoina haitensis Sowerby, 1849, Quart, jour. Geol. Soc. London, 

 vol. 6, p. 50. 



Pleiwotoina virgo Moore, 1853, Quart. Jour. Geol. Soc. Lond., vol. 9, 

 p. 130- 



Pleurotoma barretti Guppy, 1866, Quart, Jour. Geol. Soc. London, vol. 



22, p. 290, pi. 17, fig. 6. 

 Pleurotoma antillarum Crosse, 1865, Journal de Conchyliologie, vol. 



13, p. 34, pi. I, fig. 8. Not of d'Orbign)^ 

 Turris {Surcula') virgo Gabb, 1873, Trans. Amer. Phil. Soc, vol. 15, 



pp. 206, 207. 



Pleurotoma albida Dall, 1890, Trans. Wagner Free Inst. Sci. , vol. 3, 



pt. I, p. 28, pi. 4, figs. 8a. 

 Pleurotoma albida Brown and Pilsbry, 191 1, Proc, Acad. Nat, Sci. 



Phila., vol. 63, p. 343. 

 Pleurotoma haitensis Cossmann, 1913, Jour, de Conchyliologie, vol. 



61, p. 16, pi. 2, figs. 1-4. 

 Pleurotoma cf. antillo^ruvi Cossmann, 1913. Jour, de Conchyliologie, 



vol. 61, p. 18, pi. 2, figs. 5, 6. 

 Turris albida Dall, 1915, Bull. 90, U. S. Nat. Museum, p. 38, pi. 5, fig. 



13, pi. 14, fig. 7. 



