222 PROCEEDINGS OF THE ACADEMY OP ^18*79. 



hayes ("Coquilles Fossiles," i., p. 51) it agrees in all essential 

 respects. As in the case of the French species it frequently re- 

 solves itself into two layers, the inner of which may at first sight 

 be readily mistaken for a new species (C.bicostata ? Nyst). The 

 C. gibba, Olivi, which, according to Nyst, is the equivalent of C. 

 Murchisonii, Lea, is a Miocene (?), Pliocene, and living species. 

 I have been unable to institute direct comparisons for want of 

 specimens. 



Cytherea Mortoni, Con. J. A. N. S., vii., p. 150. 



This species of Cytherea was originally confounded by Conrad 

 with the G. erycinoides, Lam. (Foss. Shells of Tert., 1832, p. 34), 

 but a close examination shows the latter to be comparatively more 

 elevated, and its ribs to be proportionately much more robust. 



Trochita trochiformis, Lea. Contr., p. 96, pi. 3, fig. 76. 



This species, described as new by Mr. Lea in 1833, is synony- 

 mous with T. (Calyptrxa) trochiformis of Lamarck (Trochus 

 apertus, Brand.). 



Cylichna galba, Con. Foss. Shells of Tert., p. 34, as Volvaria. 

 {Bulla St. Hillairii, Lea.) 



This species appears to me to be erroneously referred by Bronn 

 to Bulla constr'icta, Sow. (Miner. Conch., vol. v., p. 96), as 

 Sowerb} r 's species has no fold on the columella, at least no men- 

 tion is made of it in his description, nor does it appear in his 

 figure. Our species appears to be closely allied to if not identical 

 with Bulla Brocchii, Bronn, an Italian (Miocene?) species (Brocchi, 

 Conch. Foss. Subapenn., ii., p. 217, as Bulla ovulata? Lam.). 



Cypraedia fenestralis, Con. Proc. A. N. S , vii. p. 262. 



This appears to me to be identical with Cyprsea (Luponia, 

 Graj') elegans of Defrance, from which I cannot discover any dis- 

 tinguishing: characters. Conrad states that no mention is made 

 by Deshaj^es in his description of the fossil of the Paris basin of 

 " microscopical regular lines," but an examination of a specimen 

 in the Academy collection shows them to be present. 



Tornatella (Actseon) pomilia, Con. Foss. Shells of Tert.. p. 45. 

 Actceon punctatus, Lea. 

 Monoptygma elegans, Lea. 



= Tornatella inflata? Ferussac. 



I 



Tornatella (Tornatellaea) bella, Con. 



A comparison of this species with Sowerby's description and 



