TRANSACTIONS OF WAGNER 

 1526 



TERTIARY FAUNA OF FLORIDA 



Jersey. T. cnrta Conrad, a recent form from California, has not yet been 

 recorded as a fossil. 



Subgenus CYATHODONTA Conrad. 



Cyathodonta semirugosa Reeve. 

 Thracia plicata Reeve, Conch. Icon., xii., Thracia, pi. ii., fig. 7a (only), 1859; Hanley, 



Descr. Cat. Rec. Sh., p. 21, pi. x., fig. 27, 1843; Reeve, Conch. Syst., i., pi. xxxv., 



fig. 2, 1843. 

 Not Thracia plicata Deshayes, Encycl. Meth,, iii., p. 1039, 1832, and Kiener, Icon. Coq. 



Viv., fasc. cix., Thracia, pi. ii., fig. "3, 1836. Senegal, 

 Thracia semirugosa Reeve, Conch. Icon., xii., notes to pi. ii., fig. 7, 1859, West Indies. 

 Thracia dissimilis Guppy, Ann. Mag. N. Hist., 4th Ser., xv., p. 52, 1874. Trinidad. 

 f Thracia magnifica Jonas, P. Z. S., 1849, p. 170, pi. vi., fig. 7; Reeve, Conch. Icon., xii., 



Thracia, pi. ii., fig. 11, 1859. Honduras. 



Pliocene marl of the Caloosahatchie River, Florida, Dall ; living in the 

 Caribbean Sea near Santa Cruz in thirty-eight fathoms, near Trinidad Island, 

 and on the coast of Honduras. 



By following Hanley and Reeve the name plicata Deshayes has been gen- 

 erally used for the Caribbean Cyathodonta, but an examination of Deshayes' 

 species as figured by Kiener from the types shows that it is entirely distinct 

 from the American form, and Deshayes in his edition of Lamarck states that 

 it probably came from Senegal. On the other hand, Hanley, in 1843, identified 

 with Deshayes' species a Cyathodonta from New Holland, perhaps that after- 

 wards named Thracia granulosa by Adams and Reeve. I have some suspicion 

 that T. magnifica Jonas is only a very finely developed specimen of the semi- 

 rugosa, in which case the latter name must give way, but in view of the dififer- 

 ing proportions it seems best to wait for more information before uniting them. 

 Reeve and Cuming united the Caribbean species with Conrad's Lower Cali- 

 fornian undulata, which is distinct. Reeve's figures, yh and 7c, were possibly 

 drawn from Californian specimens. 



Cyathodonta vicksburgiana n. sp. 



Plate 57, Figure 27. 



Vicksburgian Oligocene, at Vicksburg, Mississippi. 



Shell elongate, the right valve convex, the anterior end longer, slightly 

 attenuated, and evenly rounded; posterior end shorter, rather abruptly verti- 

 cally truncated, compressed above with a rounded ridge extending from the 

 beak to the lower posterior angle ; beaks low, somewhat recurved, situated at 



