1884.] NATURAL SCIENCES OP PHILADELPHIA. 10 Y 



of the spire and determined this species from descriptions and 

 figures of European specimens. It is here only necessary to say 

 that I concur in Heilprin's determination after liaving compared 

 perfect shells from Claiborne with perfect German ones (Stern- 

 berger Oligocene). In my opinion a direct comparison of specimens 

 is conditio sine qua non in the identification of species from both 

 sides of the Atlantic. 



The Claiborne specimens are apparently Pleur. Baumonti Lea, 

 but the name of Basterot has the priority. 



Pleur. denticula Bast., which occurs also in Italy, seems to be 

 widely spread in the Tertiary. 



3. Pleurotoma Volgeri Phil. 



? 1804. Pleurotoma terebralis Lamarck. 



Deshayes, Coq. foss. 1824-37, vol. 11, p. 455, tab. 62, flg. 14-16. 



1846. Pleurotoma Volgeri Phil. 



Phillppi,Verzeich. d. In d. Geg. v. Magdeburg aufgef. Tertlaerverstein., 

 Palseontographica, 1, Aug. 1846, p. 69, tab. 10 a, fig. 2. 



1847. Pleurotoma cristata Conr. 



Com-ad, Proc. Ac. Nat. Sc. Phllad., ill, p. 284 (no figure). 



1848. Pleurotoma cristata Cdnr. 



Conrad, Journ. Ac. Nat. Sc. Phllad., 1, 2d series, p. 115, tab. 11, 

 fig. 20. 

 1860. Turris cristata Conr. 



Gabb, Journ. Ac. Nat. Sc. Phllad., vol. Ix, 2d series, p. 378, tab. 67, 

 fig. 12, non fig. 8. 

 ? 1861. Pleurotoma Volgeri Phil. 



Edwards, Monogr. of the Eocene Moll, of England, p. 275, tab. 30, 

 fig. 15 a, b, non fig. 13. (Publ. Paleontogr. Soc. London, issued as 

 volume for 1858, publ. 1861.) 

 ? 1861. Pleurotoma terebralis Lam. 



Edwards, ibid., p. 233, tab. 27, fig. 10 a-k. 

 1865. Cochlespira engonata Conr. 



Conrad, Am. Journ. of Couchology, 1, p. 142, figm-e in the same volume, 

 tab. 21, fig. 12. 

 1865. Cochlespira bella Conr. 



Conrad, ibid., p. 210, tab. 21, fig. 6. 

 1867. Pleurotom,a. Volgeri Phil. 



V. Koenen, Mar. Mlttelollgocsen, Palaentogr., xvl, p. 92. 

 1867. Pleurotoma Volgeri Phil. 



Speyer, Conch yl. d. Casseler Tertlaers, Palseontogr., xvl, p. 193, tab. 

 19, fig. 12 a, b. 

 1872. Pleurotoma terebralis Lam. 



Koch und Wiechmann, Die Molluskenfauna des Sternberger Gesteins 

 in Mecklenburg, p. 66. 



