TRANSACTIONS OF WAGNER 



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. 



SporteUa "WTiitfieldi 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 5. 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, 4a. 

 Amphidesma constricta Conrad, Am. Journ. Sci., xli., p. 347, pi. 2, fig. 15, 1841 ; Trans. 

 Am. Assoc. Nat. and Geo!., i., p. no, pi. 5, fig- iS, 1842; Fos. Med. Tert., p. 76, pl- 

 43, fig. 10, 1845. 

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

 Fahella 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, 4a, 1898. 



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



