210 SYSTEiJATIC PALEONTOLOGY 



closely wound on the lower and smaller of three prominent elevated re- 

 volving ribs ; longitudinal wrinkles most prominent on the early whorls ; 

 body whorl large, with three very prominent elevated revolving ribs with 

 a fourth rudimentary one Ijelow it on the largest specimens ; spaces be- 

 tween the elevated ribs and below them with many impressed revolving 

 lines between which the surface is gently convex ; umbilicus widely flaring 

 in the largest specimens, almost absent in the young. 



Length, 40 mm. ; diameter, 36 mm. 



Occurrence. — Calvert Formation. Plum Point, Truman's Wharf, 

 Chesapeake Beach, 3 miles south of Chesapeake Beach, Fairhaven, 

 A^Tiite's Landing. 



Collections. — Maryland Geological Survey, Johns Hopkins University, 

 U. S. National Museum, Cornell University. 



ECPHORA TAMPAJiNSIS (Dall). 



Plate LII, Figs. 9, 10. 



Rapana tampaensis Dall, 1890, Trans. Wagner Free lust. Sci., vol. iii, pt. i, p. 153. 

 Bapana tampaensis var ? Dall, 1892, Trans. Wagner Free Inst. Sci., vol. iii, pt. ii, 



p. 244, pi. XX, fig. 14. 

 Fasciolaria (Lyrosoma) sulcosa Whitfield, 1894, Mon. xxiv, U. S. Geol. Survey, 



p. 100, pi. xvii, figs. 9, 10. (Not of Conrad.) 

 Rapana (Ecphora) tampaensis Cossmaun, 1903, Essais de Paleoconch.Comp., vol.v, p. 



6.5. 



Description. — "Shell rather small, short-spired; last whorl much the 

 largest; spiral sculpture of eight or nine primary ridges, elevated and 

 square-sided, of which one is near the suture, two others (a little larger) 

 with subequal interspaces in front of the first, then an interspace of greater 

 width with the strongest spiral in front of it, then the peripheral inter- 

 space, twice as wide as the strongest spiral, then another strong spiral 

 followed by a narrower channel, and three more basal spirals with dimin- 

 ishing interspaces on the base, and three or four rather obscure and less 

 elevated spiral cords on the canal ; of secondary spirals much smaller than 

 the primaries, there are one or two in the wide peripheral channel, and 

 sometimes a single one elsewhere ; lastly, the whole surface is more or less 

 sculptured by fine, incised spiral lines. The transverse sculpture is of 

 fine wrinkles, in harmony with the incremental lines, which cover most 

 of the shell ; the ribs are slightly but irregularly undulated in some places; 

 aperture ovate, pillar-lip with a thin, smooth callus ; edge of the outer lip 

 undulated by the sculpture, the interior Urate, with about ten sharp, 



