TRANSACTIONS OF WAGNER 



846 



TERTIARY FAUNA OF FLORIDA 



Corbula (Aloidis) Wailesiana Harris. 

 Corbula I\'iu7,-siiiiiii Harris (MS. in Coll. U. S. Nat. Mus.). 



Corbitla bicannata Conrad, Proc. Acacl. Nat. Sci. I'hila., vii., p. 258, 1855 ; \Vailes, Rep. 

 Geol. Miss., p. 289, pi. 14, fig. 3, 1854; not of Sby., P. Z. S., 1833, p. 35. 



Jacksonian Eocene of Jackson, Mississippi ; Drew and Cleveland Counties, 

 Arkansas, and Montgomery, Louisiana. 



This is a fine species, closely resembling the C. onisats, but separable by 

 minor details. 



The other species which have been referred to the Eocene are : C. filosa 

 Conrad (Am. Journ. Conch., i., p. 137, pi. 10, fig. 7, not p. 145, 1865), from 

 the Jacksonian of Mississippi ; C. nasiitoides Whitfield (Lam., Raritan Clays, 

 p. 239, pi. 30, figs. 1 8, 19, 1885), from the Eocene marl of New Jersey, which 

 is possibly not a Corbula, and C. pearlensis Meyer (Bull. Ala. Geol. Surv., i., 

 p. 83, pi. 3, figs. 16, i6<?, 1886), from Jackson, Mississippi, which may prove 

 to belong to some other genus, as the figure certainly has not the aspect of a 

 Corbula. Corbula prinia de Gregorio was correctly described originally by 

 Aldrich as a Necera (= Ctispidaria). 



Oligocenc Species. In the Lower Oligocene, or Vicksburgian, besides those 

 forms which have been mentioned as coming up from the Eocene, there are two 

 species which have been called alta by Conrad. The first (Journ. Acad. Nat. 

 Sci. Phila., 2d Ser., i., p. 124, pi. 12, figs. 33-35, 1848) I have not seen, but, 

 from the figures, should conclude it to be different from the shell figured in 

 1850 (op. ctl., ii., pi. i., fig. 3) under the same name, and for which Conrad in 

 1866 (Am. Journ. Conch., ii., p. 76) proposed the name of alifonnis. This is 

 a very singular shell, for which de Gregorio has very properly proposed a 

 subgeneric name (Tiza, q. v., p. 838), and it is said by Conrad to come from a 

 horizon above the typical Vicksburgian, which he correlates with the Shell 

 Bluff group of Georgia. C. intastriata Conr. (1848), later called interstriata 

 (Eoc. Checkl., 1866), appears to be a Cuspidaria. 



Including those previously mentioned under the Eocene, the following 

 species completes the list of known Vicksburgian Corbulas. 



Corbula (Cuneocorbula) engonata Conrad. 



Lcsuctir, Walnut Hills Fossils, pi. 5, fi^j. 18, 1829. 



Corbula eiigonata Conr., Proc. Acad. Nat. Sci. Phila., iii., p. 294, 1848; Journ. do., 2d 



Ser., i., p. 124, pi. 12, fii;. 30, 1848; not of Aldrich, Bull. Ala. C.cnl. Surv., i., p. 



58, 1886. 



