FREE INSTITUTE OF SCIENCE 



85- 



TERTIARY FAUNA OF FLORIDA 



Corbula (Aloidis) caloosse n. s. 

 Plate 36, Figure 16. 



Pliocene marls of the Caloosahatchie, Shell Creek, and Myakka Rivers, 

 south Florida ; Dall and Willcox. 



Shell inflated, very inequivalve, nearly inequilateral; within the right 

 valve a high, prominent, incurved beak ; in the left valve the beak is much 

 lower and less curved ; the general form is ovate, hardly truncate behind, 

 with no differentiated rostrum or rostrum keels ; in some specimens the latter 

 are represented by obsolete rounded ridges which fail towards maturity; sculp- 

 ture of fine incremental lines, and on the right valve strong concentric undula- 

 tions which cover the shell as far back as the margin of the posterior dorsal 

 area, but are not absolutely in harmony with the Hnes of growth ; the left 

 valve has no undulations, but shows sparse, irregularly distributed radial 

 threads; cardinal tooth strong, chondrophore in the left valve lamelliform 

 and rather long. Lon. 12.5, alt. right valve 10, left valve 7.5, diam. 6.5 mm. 



This species is more elongated, less triangular, and less distinctly rostrate 

 than the recent C. {A}j disparilis Orbigny of the Antillean region. In the latter 

 there is a distinct recurvature of the posterior dorsal slope, while in the former 

 there is under the posterior dorsal margin a ledge or ridge against which the 

 edge of the left valve fits, and which is quite absent in the recent shell. 



Corbida [Erodona ?) priscopsis Harris (Bull. Pal., iii., p. 94, pi. 2, figs. 5, 5 a, 

 1895), from two thousand four hundred and forty-five feet below the surface 

 in the Galveston, Texas, artesian well, belonging to the Upper Miocene, if 

 really an Erodona is the only North American species from any of the marine 

 Tertiary beds of the coastal region. 



Corbula (Cuneocorbula) inaequalis Say. 

 Corbida incEqualc Say, Journ. Acad. Nat. Sci. Phila., iv., p. 153, pi. 13, fig. 2, 1824; not 



of Conrad, Med. Tert., p. 6; Tuomey and Holmes, Pleioc. Eos. S. Car., p. 76, pi. 



20, fig. 12. 

 Corbula citncata Conrad, Fos. Medial Tert., p. 5 (excl. diag.), pi. 3, fig. 2, 1S40 ; Harris, 



Bull. Pal., v., pp. 329, 346, pi. 13, fig. 2, 1896 ; not of Say, 1824. 

 Corbula incequalis Meek, Checkl. Inv. Fos. N. Am. Miocene, p. 12, 1864. 



Miocene of Maryland at Calvert Cliffs, Jones's Wharf, Fairhaven, Plum 

 Point, Greensborough, St. Mary's, the Choptank and Patuxent Rivers; of Vir- 

 ginia, at Suffolk, on the Nansemond and York Rivers ; at Magnolia and 

 Wilmington, North Carolina ; Turkey Creek, South Carolina ; and in the 



