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 v/horl 15 mm. 



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

 Columbus Island, about one mile north of the cit)^ of Bocas del 

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

 More 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. taiirhta, also from this locality, is somewhat similiar 

 but differs b)' its more convex whorls, deeper fasciole and prati- 

 cally lacks all axial sculpturing. 



Gatun Stage: Bocas del Toro, Payiama. 



Genus TURRIS Bolton 



Turris albida Perry Plate 4, figres i, 2 



Pleurotovia albida Perry, i8ri. Conch. Expl., pi. 32, fig. 4. 

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

 Pleurotoma haitensis Sowerby, 1849, Quart. Jour. Geol. Soc. London, 



vol. 6, p. 50. 

 Pleurotoma 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 antillarmn Ciosse, 1865, Journal de Conchyliologie, vol. 



13, p. 34, pi. I, fig. 8. Not of d'Orbigny. 

 Turris [^Surcida) 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. 

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



Phila., vol. 63, p. 343. 

 Plei^rotoma haitensis Cossmann, 1913, Jour, de Conchyliologie, vol. 



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

 Pleurotoma cf. antillaruvi Cossmann, 191 3, Jour, de Conchyliologie, 



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

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



13, pi. 14, fig. 7. 



