TRANSACTIONS OF WAGNER 

 1084 



TERTIARY FAUNA OF FLORIDA 



This profusely ornamented species is naturally usually more or less de- 

 fective, but under all conditions is a remarkable shell. 



Cardium (Trachycardium) lingualeonis Guppy. 



Cardium lingualeonis Guppy, Quart. Journ. Geol. Soc. London, vol. xxii., p. 293, pi. xviii., 



fig. 7, 1866. 

 < Cardium subelongatum Gabb, Geol. St. Domingo, p. 250, 1873 ; not of Sowerby, 1840. 



Oligocene marl of the Chipola horizon on Shoal River, Walton County, 

 Florida; and of Bowden, Jamaica. 



This species has thirty-two ribs, which are closer together than in the 

 preceding species, while the edges of the surmounting keels are undulated, 

 twisted, and rippled as confectioners do with ribbons of pulled candy. The 

 shell is narrower and less oblique than C. cestum. 



Cardium (Trachycardium) delphicum n. sp. 



PLATE 48, FIGURE 18. 



Oligocene of the Ballast Point, Tampa, silex beds, and of the Oak Grove 

 sands, Florida. 



Shell small, solid, thick, subovate, with high beaks, nearly equilateral; 

 sculptured with twenty-eight to thirty-one strong, high, triangular ribs, with 

 much narrower, hardly channelled interspaces, both longitudinally and con- 

 centrically feebly striated ; the first six or seven ribs are furnished with the 

 usual cup-like projections, but succeeding ones show the cups narrowing and 

 compressed above so as to form strong A-shaped imbrications ; at about the 

 nineteenth rib the anterior wing of the A seems to become obsolete and the 

 posterior wing, persisting on the posterior side of the ribs, more and more 

 oblique and nodulous ; interior margin with rather small flutings continued as 

 sulci nearly to the middle of the shell ; posterior margin feebly serrate ; hinge 

 short, strong. Alt. 33, Ion. 28, diam. 24 mm. 



This represents in the Oak Grove fauna the C. isocardia type. The Bal- 

 last Point specimens have only twenty-eight ribs and may belong to another 

 species ; as they are rather poor silicious pseudomorphs I have preferred to 

 class them here, at least temporarily. 



Oardium (Trachycardium) Emmonsi Conrad. 



Cardium muricatum Emmons, Geol. Rep. N. Car., p. 301, figs. 232-233, 1858; Conrad, 

 Proc. Acad. Nat. Sci. Phila. for 1862, p. 576, 1863; not of Linne, 1758, nor Tuomey 

 and Holmes, 1856. 



