232 PALEONTOLOGY OF NEW JERSEY. 
Order SCUTIBRANCHIATA. 
Suborder PODOPHTHALMA. 
PLEUROTOMARIID. 
Genus LEPTOMARIA Deslonchamps. 
LEPTOMARIA (?) PERLATA. 
Plate xxxv, Figs. 1-4. 
Pleurotomaria perlata Conrad: Am. Jour. Conch., vol. 1, p. 213, Pl. xx1, Fig. 7; 
Meek, Geol. N. J., Newark, 1868, 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 junction of the 
outer sloping surface 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 marked species which appear to have been 
considered as one. Mr. T. A. Conrad described this form in 1865 asa 
Pleurotomaria, 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 
