TRANSACTIONS OF WAGNER 

 850 



TERTIARY FAUNA OP FLORIDA 



Corbula (Aloidis) heterogenea (hippy. 



PLATE 36, FIGURE 15. 

 Corbttla hftcivgcnca Guppy (MS. in Coll. U. S. Nat. Mus.). 



Eocene of Vamos-vamos Station on the Panama Canal and at Gatun, 

 Isthmus of Darien ; Oligocene of the Bowden beds, Jamaica, the Chipola 

 River, and the lower bed at Alum Bluff, Chattahoochee River, Florida; Upper 

 Oligocene of Oak Grove, Santa Rosa County, Florida; Miocene of the upper 

 bed at Alum Bluff, and of Magnolia, Duplin County, North Carolina; Plio- 

 cene of Walton County, Florida, and of the marls of the Caloosahatchie and 

 Shell Creek, Florida ; Willcox, Dall, and Burns. 



This form is very close to C. vie la, but differs from it in having the beaks 

 narrower, less elevated, and less prominent, and the posterior part of the 

 shell more produced. Lon. 9.5, alt. 8, diam. 5 mm. 



After examining many hundred specimens and finding the above differ- 

 ences constant, I have considered them to be of specific value. In other 

 respects the shells are practically identical. 



Corbula (Bothrocorbula) viminea Guppy. 

 Corbula viminea Guppy, Quart. Journ. Gcol. Soc. Lond., xxii., p. 293, pi. 18, fig. II, 



1866. 



? Corbula Bradley! Nelson, Trans. Conn. Acad. Sci., ii., p. 17, 1870. 

 Bothracorbula vitninea Gabb, Proc. Acad. Nat. Sci. Phila. for 1872, p. 274, pi. 10, figs. 



3, 3 a ; Geol. St. Domingo, p. 247, 1873. 



Eocene of Vamos-vamos Station, Panama Canal, Isthmus of Darien ; 

 Oligocene of St. Domingo (Gabb) and Bowden, Jamaica ; Henderson and 

 Guppy. 



This is a large and solid species in which thejolnular depression is deep 

 and subspherical ; if the other species possessed . tfiis character to an equal 

 degree the group would undoubtedly be of gene^jc value, but, as will be seen, 

 they vary in the amount of depression, so that'll connecting series of species 

 leads to Cttneocorbula without any marked break. For this reason I have not 

 considered the group as possessing generic value. 



Corbula (Bothrocorbula) synarmostes n. s. 



PLATE 36, FICURES 12, 13. 



Oligocene of the Chipola beds, Chipola River, Florida; Dall and Burns. 

 Shell of moderate size, solid, ovate, pointed behind, nearly equilateral; 



