FREE INSTITUTE OF SCIENCE 



I2S3 



TERTIARY FAUNA OF FLORIDA 



Miocene of Suffolk and the Nansemond River eighteen miles below Suf- 

 folk, and of the York River, Virginia ; of North Carolina at Wilmington, New- 

 berne, the Natural Well, and Magnolia, Duplin County ; and sixteen miles 

 southwest of Tallahassee, Florida. 



This fine species is shorter and broader than M. nimbosa and thinner and 

 more elongated than M. albaria. A slightly compressed band radiates from the 

 beaks to the lower posterior margin. 



Macrocallista pittsburgensis Dall. 



Plate 36, Figure 22 ; Plate 43, Figure 15. 



Meretrix {CalUsta) pittsburgensis Dall, Trans. Wagner Inst., iii., pp. 1192, 1199, pi. xxxvi., 



fig. 22, xliii., fig. 15, 1900. 



Eocene of Pittsburg, Oregon, in hard black shale ; J. S. Diller ; rather 

 abundant in the locality cited. 



Shell very inequilateral, subcompressed, elongate oval, with rather promi- 

 nent, irregular, incremental lines ; covered with a conspicuous periostracum 

 which is preserved in the fossils ; b'eaks small, low, somewhat anteriorly 

 directed ; lunule lanceolate, smooth, rather large, bounded by an incised line ; 

 anterior dorsal slope short, straight ; posterior slope moderately arcuate, long ; 

 ends rounded, base arcuate ; hinge normal ; posterior right cardinal bifid ; pal- 

 Hal sinus pointed in front, nearly reaching the middle of the shell. Length 36, 

 height 21, diameter 11 mm. ; the beaks one-fifth of the length from the anterior 

 end. 



Macrocallista albaria Say. 



Cytherea albaria Say, Am. Conch., pi. lix., fig. 1-2, 1834; Binney's reprint, do., p. 219, 

 1858; Conrad, Fos. Medial Tert., p. 13, pi. viii., fig. 2, 1838 (Santee River, S. Caro- 

 lina). 



Dione densata Conrad, Proc. Acad. Nat. Sci. Phila. for 1862, p. 586, 1863 ; Meek, Check!. 

 Miocene Fos., p. 9, 1864; Am. Journ. Conch., iv., p. 278, 1869. 



Callista densata Conrad, Am. Journ. Conch., iv., p. 278, pi. xix., fig. 2, April, 1869 

 (Petersburg, Va.). 



Callista virginiana Conrad, Proc. Acad. Nat. Sci. Phila. for 1862, pp. 575, 586, 1863 ; 

 Am. Journ. Conch., v., p. 39, pi. ii.; fig. i, July, 1869 (Petersburg, Va.). 



Dione idonea Conrad, Proc. Acad. Nat. Sci. Phila. for 1862, p. 575, 1863 ; Meek, Checkl. 

 Miocene Fos., p. 9, 1864. 



Dione albaria Meek, Checkl. Miocene Fos., p. 9, 1864. 



Dione virginiana Meek, op. cit., p. 10, 1864. 



Cytherea reposta Emmons, Geol. Rep. N. Car., p. 294, fig. 222, 1858; not of Conrad. 



