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669 



TERTIARY FAUNA OF FLORIDA 



represented by very imperfect material. In the Eocene of New Jersey, Con- 

 rad has found an unrecognizable internal cast to which he has given the name 

 of P. annosa. It is regarded as a Gastropod fragment. A well-established 

 species is P. limula Conrad (+ claiborncnsis Lea, and trigona Conr. non 

 Lam.) from the Claiborne sands. The Oligocene of Vicksburg has furnished 

 the P. argcntca Conr., that of St. Domingo and Bowden, Jamaica, the P. 

 inornata of Gabb, the Miocene of Virginia, the P. nntltangnla of H. C. Lea. 

 An unnamed species has been observed in the Midway stage of the Eocene 

 of Georgia by Professor G. D. Harris. De Gregorio has named an unrecog- 

 nizable fragment from Claiborne Avicnla cardiacrassa, but there is nothing to 

 indicate any distinctive specific characters in it. Cossmann, after the ex- 

 amination of a full series, unites it to A. claiborncnsis. 



Pteria argentea Conrad. 



.t<>ii-itlii ai-^t-iiti-tt Conr., (ourn. Acad. Nat. Sci., 2cl Ser., i., p. 126, pi. 12, fifj. 10, 1848; 

 1'roc. Acad. Nat. Sci. I'hila., iii., p. 295, 1847. 



Lower Oligocene of Vicksburg, Mississippi ; Conrad. 



Pteria (argentea var. ?) chipolana Uall. 



Upper Oligocene of the Chipola beds on the Chipola River, the lower 

 bed at Alum Bluff, etc., Calhoun County, Florida; Burns and Dall. 



Small, with a straight hinge-line and narrow, deep ligamentary sulcus, the 

 right valve with a small, well-marked cardinal tooth fitting into a small pit in 

 the opposite valve; anterior wing short, small, with a narrow byssal sinus 

 marked on the auricle by a short groove, external surface smooth, the posterior 

 wing feebly set off; valves rather compressed, none of the valves exceeding 

 twenty-five millimetres in length. 



It is probable that this represents a species distinct from that of Vicks- 

 burg, but the material in my possession is insufficient to determine the question, 

 but the type of /'. argentea shows little trace of a byssal sinus and is more 

 inequilateral than our shell. 



Pteria multangula 11. ('. Lea. 

 .l~,'i<-iifii niiilliiii^nlii 11. C. Lea, Trans. Am. Phil. Soc., ix., p. 245, pi. 35, fijj. 31, 1845. 



Miocene of Petersburg, Virginia, Lea ; and of the upper bed at Alum 

 l>luff, Florida, Burns. 



