TRANSACTIONS OF WAGNER 

 1128 



TERTIARY FAUNA OF FLORIDA 



Sportella lioconcha n. sp. 

 PLATE 44, FIGURE 24. 



Oligocene sands of Oak Grove, Santa Rosa County, Florida; Burns. 



Shell oblong, moderately inflated, evenly rounded, the ends subequal in 

 outline; surface smooth or with some incremental irregularities, sculptured 

 with very fine concentric and obsolete, microscopic, radial striae; interior 

 polished, with faint radial striations ; beaks low, inconspicuous, with a minute, 

 brilliantly polished prodissoconch ; hinge narrow, cardinals more or less du- 

 plex in the young, single, straight and prominent in the adult; pit for the 

 resilium distinct, triangular, short; ridge for the ligament small, short but 

 obvious. Lon. 14, alt. 9.5, diam. 6 mm. 



This is a very elegant species with somewhat the aspect of a Scintilla but 

 the typical hinge of Sportella. 



Sportella Whitfleldi Dall. 

 Abra nuculoides Whitfield, Mio. Moll. N. J., p. 81, pi. 15, figs. 7-9, 1894; not of Conrad. 



Lowermost Miocene marl at Jericho, Cumberland County, New Jersey, 

 and uppermost Oligocene of the Oak Grove sands, Santa Rosa County, Florida ; 

 Burns, Miocene of Maryland, State Geological Survey. 



Professor Whitfield's type is in the National Collection, together with a 

 fragment, apparently of the same species, from the Oak Grove sands. This 

 species resembles some of the species we have referred to Montacuta, but has 

 a coarser and heavier hinge. It recalls S. corbulina Desh. In some respects 

 it foreshadows the 6". constricta, but is more inflated and much more inequi- 

 lateral, the anterior side produced, the posterior very short, blunt, and almost 

 truncate. 



Sportella constricta Conrad. 



PLATE 25, FIGURE 4, 40. 

 Amphidesma constricta Conrad, Am. Journ. Sci., xli., p. 347, pi- 2, "8- I S, 1841; Trans. 



Am. Assoc. Nat. and Geol., i., p. no, pi. 5, fig. 15, 1842; Fos. Med. Tert, p. 76, pi. 



43, fig. 10, 1845. 



Syndosmya constricta Conrad, Proc. Acad. Nat. Sci. Phila., vii., p. 29, 1854. 

 Fabella constricta Conrad, Proc. Acad. Nat. Sci. Phila. for 1862, pp. 574, 586, 1863; 



Meek. S. I. Checkl. Mio. Fos. N. Am., p. 11, 1864; Dall, Bull. 37, U. S. Nat. Mus., 



p. 48, 1889. 

 Sportella constricta Dall, Trans. Wagner Inst. Sci., p. 920, pi. 25, figs. 4, 40, 1898. 



Miocene of Petersburg, Virginia, of North Carolina at Magnolia and the 



