GASTEROPODA OF THE EOCENE MARLS. 215 
PLEUROTOMID &. 
Genus PLEUROTOMA Lamarck. 
PLEUROTOMA SURCULITIFORMIS 0. sp. 
Plate xxx, Figs. 3, 4. 
Shell elongate and slender, spire elevated, turreted, containing five 
or six volutions, and forming, above the point of greatest diameter of the 
body whorl, about three-fifths of the entire length of the shell. Body 
volution rather large in proportion to those above. Volutions concave 
above but rapidly sloping, ventricose, and rounded below the angle, the 
last one extended below, forming a short beak. Aperture moderately 
large. Shell marked by fine, even, spiral lines over its entire surface; 
also by finer transverse lines which are broadly curved backward on the 
upper concave portion and forward on the body of the whorl. 
This species is somewhat related in its form and surface striz to 
P. elaborata Conrad, from the Claiborne beds (Foss. shells Tert. Forma- 
tions, p. 52, Pl. xxu, Fig. 19), but differs in the smaller number and higher 
volutions and in the somewhat longer beak. It also resembles P. alternata 
Conrad, trom the same beds figured on the same plate, in the form of the 
volutions and surface markings but is a less robust and smaller shell and 
the anterior beak is proportionally shorter. | 
Formation and locality: Inthe upper layer of the Upper Green Marls, 
at Shark River, New Jersey. From the collection at Rutgers College. 
PLEUROTOMA REGULARICOSTATA, N. Sp. 
‘Plate XX XIII, Figs. 7-9. 
Shell small, very slender, spire elevated, forming less than half of the 
entire length of the shell; the volutions rather high between sutures, num- 
ber unknown. Body volution and beak forming rather more than half of 
the entire length; moderately ventricose in the middle without perceptible 
angle, but with a slightly concave depressed sulcus below the suture. Su- 
tures distinct, bounded below by an elevated ridge. Anterior beak long, 
slender, and bent. Aperture apparently of medium size. Surface of the 
