106 PROCEEDINGS OP THE ACADEMY OF [1884. 



of Professor Yerrill, specimens of Cer. terebralis Ad., which 

 species was the looked-for identical one. 



The description and figure of Terehra constyHcta H. C. Lea are 

 poor, but there is no doubt about this determination of my 

 specimens from . Claiborne, which are quite identical with the 

 German ones. 



Among the synonyma, Ger.mundulum'DQ?,\\. is given, although 

 I have no specimens of this species ; but I cannot find any differ- 

 ence to distinguish it from the figure and description given by 

 Deshayes of Cer. trilineatum^ and, as such a competent observer 

 as Speyer has said the same, I do not think I have made a 

 mistake. 



Cer. trilineatum, occui's in the American Miocene. I received 

 one specimen of it labeled : " Terehra trilirata Conr.," but I 

 could not find this name in any of Conrad's papers. Professor 

 Heilprin writes to me : "Possibly it is one of the numerous forms 

 that Conrad named without description." 



If Cer. trilineatum Phil, should be identical with Cer. turellum 

 Grat., of which I have no specimens, the latter name would have 

 the priority. 



Cer. trilineatum Phil, is generally distributed in the older and 

 later Tertiary and also at the present time on both sides of the 

 Atlantic. 



2. Pleurotoma denticala Bast. 



1835. Basterot, Descr. Geol. du bassin tert. sud-ouest de la France, p. 63, 



tab. 3, fig. 12. 

 1833. Pleurotoma Bmimonti Lea. 



I. Lea, Contrib. to Geology, p. 134, tab. 4, fig. 127. 

 1844. Pleurotoma denticula Bast. 



Nyst. Descr. des. Coq. foss. de la Be1g., p. 526, tab. 44, fig. 3. 



1860. Turris nodo-carinata Gabb, fide Heilpr. 



Gabb, Descr. of new spec, of Am. Tert. a. Cret. foss. ; Journ. Ac. Nat. 

 Sc. Philad., vol. iv, 2d series, p. 379, tab. 67, fig. 13. 



1861. Pleurotoma denticula Bast. 



Edwards, Monogr. of Brit. Eocene, p. 286, tab. 30, fig. 7 a-h, 

 1867. Pleurotoma denticula Bast. 



V. Koeuen, Mar. Mitteloligocsen, p. 89. 

 1879. Pleurotoma denticula Bast. 



•Heilprin, Proc. Ac. INat. Sc. Philad., p. 214, tab. 13, fig. 10. 



The last named author writes that he found Pleur. denticula Bast, 

 in Claiborne sand. He figures a specimen without the upper part 



