TRANSACTIONS OF WAGNER 



TERTIARY FAUNA OF FLORIDA 



These species appear to be referable to Pholadidca : P. (Pliolaincria) 

 triquctra Conrad (1848) is a young shell from the Vicksburgian Oligocene 

 and resembles a young Pholadidca. It has no characters upon which the 

 undefined genus Pholamcria Conrad (1865) can be maintained. Pholadidca 

 (Penitclld) penita Conrad, 1838 (+ P. spclcea Conr., 1855), and P. (J } .) ovoidca 

 Gould, 1853, are known from the Pleistocene of California and may turn up 

 in older horizons. Zirfaa plana White, which is a young shell, may eventually 

 find a place hereabouts. 



Parapholas is represented in the Eocene marls of New Jersey by P. 

 Kneiskerni Whitfield (Lam., Eo. N. J., p. 241, pi. 30, figs. 22-24, 1885); and 

 in the later Tertiaries of California by P. californica Conrad, also found recent 

 on the same coast. 



The genus Martesia includes M. clongata Aldrich, 1886, from the Chicka- 

 sawan Eocene of Bell's Landing, Alabama; M. texana Harris, 1895, from the 

 Claibornian of Texas; M. clausa Gabb, 1866, from the Tejon Eocene of 

 California; M.striata Linne is reported by Guppy and Gabb from the Pliocene 

 of Trinidad and Costa Rica; M. cuneiformis Say, 1822, from the Miocene 

 of Yorktown, Virginia, and the Pleistocene of South Carolina; and M. tnter- 

 calata Cpr., 1857, from the same horizon in California. Marlcsia Dalli Harris, 

 1895, from the Midway Eocene of Georgia, appears from the figure to be 

 more like a Gastrocluzna ; it is certainly not a Martesia. M. sphceroidalis 

 Guppy, from Bowden, is probably referable to another group. 



The following species may be a Marlcsia, though there is no trace of 

 any accessory valves except the protoplax. 



Martesia? ovalis n. s. 

 I'I.ATK 36, FIGURE 5. 



Miocene of Maryland, at Plum Point ; Harris. 



Shell small, short; valves somewhat lozenge-shaped with a single, nearly 

 median, radial furrow ; in front of the furrow the valve is covered with crowded, 

 fine, somewhat pectinated lamellae ; behind, sculptured only with rather coarse 

 concentric incremental lines; the posterior termination bluntly rounded; 

 umbonal reflection small, solid, standing up vertically from the shell with a 

 thickened edge; callum smooth, meeting that of the opposite valve without 

 overlapping; protoplax enormous, extending nearly as far back as the ends of 

 the valves and similarly forward to the anterior ends, but broken here .so that 

 it is not certain how far it may have curved anteriorly ; the lateral edges are 



