232 PALEONTOLOGY OF NEW JERSEY. 



Order SCUTIBRANCHIATA. 



Suborder PODOPHTHALMA. 



PLEUROTOMARIIDiE. 



Genus LEPTOMARIA Deslonchamps. 



LePTOMARIA (?) PERLATA. 



Plate XXXV, Figs. 1-4. 



Pleurotomaria perlata Conrad: Am. Jour. Concli., vol. 1, p. 213, PI. XXI, Fig. 7; 

 Meek, Geol. N. J., Newark, 18G8, p. 732. 



Shell very large, depressed conical and rapidly spreading, whorls three 

 to four in number, broader than high, flattened on the top, angular or car- 

 inate on the periphery, and subangular on the upper lateral margin, with the 

 intermediate surface rapidly sloping to the periphery. Base very broadly 

 and gently convex for a little more than half its width from the edge, then 

 more rapidly rounding without any angulation into the deep, broad umbil- 

 icus in which all the volutions are visible, with a scarcely perceptible suture 

 line separating them ; aperture wider than high, angular on the outer lower 

 edge, flattened above, and curved from the outer angle on the base to the 

 upper columellar margin; surface of the cast as seen on the best preserved 

 specimens very finely striated longitudinally, and showing evidence of a 

 very narrow slit in the aperture at the angle formed by the jiuiction of the 

 outer sloping stirface with the flattened upper surface of the volution. In 

 one example the slit extends for more than one-third of the length of the 

 volution. 



Among specimens presenting the general features of this species in the 

 Shark River beds I find two well m.arked species which appear to have been 

 considered as one. Mr. T. A. Conrad described this form in 1865 as a 

 PJeurotomaria, and says: "This is the only Tertiary species known to occur 

 in the eastern beds of this country. It is one of the largest of the genus 

 and approximates P. supracretacea of D'Orbigny, Pal. France." His descrip- 

 tion of the species is as follows: "Conical, depressed, rapidly widening to 

 the base; periphery slightly carinated; body whorl very wide, flattened 



