50 PALEONTOLOGY OF NEW JERSEY. 



below; outer lip slightly thickened periodically, broadly sinuate on the 

 margin in the upper part, smooth within; volutions ventricose above and 

 contracted below, longitudinally costate and spirally lined; axis not umbil- 

 icated. Type P. subdensata Conrad. 



The genus is most nearly allied to Pyrojpsis, Tudicla, and Bapa. It differs 

 from each of them in the thickened, callous columella; from Bapa in want- 

 ing the umbilicus; from Pyropsis in the shorter beak (want of angulations on 

 the volutions in some species), and in having the inner lip entirely united 

 with the columella or beak of the shell ; from Tudicla in the shorter beak, 

 smooth inner surface of the outer lip, and pyriform shape and posterior 

 channel. From some of the Tudiclas herein described under that genus, 

 there appears but shght difference except in the features of the aperture and 

 columella; and in the casts it is somewhat difficult to say to which genus 

 they belong. 



Pyrifusus ekraticus, n. sp. 

 Plate IV, Figs. 4, 5. 



Shell of medium size, a very fine specimen used, measuring 1^ inches 

 in length; nearly equally fusiform or biconical in general outline as viewed 

 from the back; apical angle about 50"^; volutions, about four in number, 

 the last one large, subangular on the periphery, concave above, rounded 

 below the middle, and contracted in the lower part; upper volutions con- 

 vex; suture distinct; aperture elongate; canal short; the volutions crossed 

 by nine or ten vertical plications, which are strong, prominent, and 

 rounded on the larger part of the volution, and but faintly marked on the 

 lower convexity of the last one, becoming obsolete before reaching the 

 beak; the entire surface of the shell also marked by beautifully rounded, 

 spiral lines, which are alternately larger and smaller, and very closely 

 arranged; these again crossed by fine transverse lines of growth, which 

 make a broad and rather !^trong retral curve from the suture to the most 

 prominent part of the longitudinal plications, below which point they again 

 bend forward to the swell of the volution below; columella and axis 

 unknown. 



