TRANSACTIONS OF WAGNER 

 712 



TERTIARY FAUNA OF FLORIDA 



attached to other bodies, are in fact Pectens, and very liable to be taken for an 

 undescribed species of that genus. They are variable in the amount of 

 spinose sculpture, and the more spiny ones often closely resemble the young 

 of the true Pec ten liastatus Sby. In the recent specimens a character by which 

 they can usually be discriminated is a suffusion of purple color on the hinge- 

 line near the cartilage-pits. 



FOSSIL FECTENS OF THE ANTILLEAN AND CENTRAL AMERICAN REGION. 



Nearly all of these species are Oligocene ; a few are referable to the 

 Pliocene; but the typical Miocene or Chesapeake fauna has not been identi- 

 fied anywhere south of Florida. The first species described from this region 

 appear in the paper by Sowerby on the Bowden fauna in 1849. As a number 

 of these were very briefly described and never figured, I sent a series of the 

 Bowden Pectens in the National Museum to Mr. Clement Reid, of the British 

 Geological Survey, who very kindly compared them with Sowerby 's types 

 and furnished me with valuable annotations upon them. In the small scries 

 available for study the range of variation necessarily remains doubtful in 

 some cases, though I have had the advantage of comparing with the series of 

 types in the Guppy collection of Antillean fossils now the property of the 

 United States National Museum. 



It appears from Mr. Reid's examination that the type specimens arc not 

 segregated in the Sowerby-Heniker collection, that the fossils are loose in 

 trays, and these trays sometimes contain more than one species. The confu- 

 sion has probably occurred since Sowerby's time, as he was a very careful 

 worker. Under these circumstances the reviser can only take the form which 

 is best in accordance with the original diagnosis and restrict Sowerby's name 

 to it. 



Pecten (Pecten) soror Gabb. 

 Janira soror Gabb, Trans. Am. Phil. Soc., xv., p. 257, 1873. 



Oligocene of St. Domingo, Gabb ; of Jamaica and Cumana, Guppy. 



A large species with twenty rounded, strong ribs, separated by flattish 

 interspaces, with fine concentric elevated lines, the flat valve also strongly 

 ribbed, the right valve very convex, and the shell a little inequilateral. 



Pecten (Pecten) eugrammatus n. s. 



I'I.ATE 34, FIGURE 22. 

 Oligocene of Haiti and St. Domingo, Guppy. 



