GASTEROPODA OF THE EOCENE MARLS. 211 
form of species referred by Tryon to the section Amoria Gray, typified by 
V. undulata Lamarck; or by Paetel in his catalogue, to Scaphella Swain., but 
there appears to be so much confusion about the sections of Voluta among 
authors that it is unsafe to refer a species to any one of the subdivisions. 
The present species would undoubtedly afford ample grounds for a distinct 
division under the hands of many, but I prefer not to divide where there 
has been so much already done, unless on the most pronounced features. 
Formation and locality: In the upper layers of the Upper Green Marls 
at Shark River, New Jersey. Collection of the Am. Mus. Nat. Hist. 
VoOLUTA (SCAPHELLA) NEWCOMBIANA. 
Plate xxx, Figs. 1-3. 
Voluta Newcombiana Whitf., Am. Jour. Conch., vol. 1, p. 263, Pl. xxvu, Fig. 12. 
Shell of medium size, elongate-elliptical in general outline, longer below 
than above the point of greatest diameter, but somewhat variable in pro- 
portions in different individuals. Spire elevated, the apical angle varying 
from 45° to 60° in different individuals, partly owing, probably, to the 
degree of distortion by compression of the casts. Volutions five or six, the 
apex not preserved in any of the specimens present. Volutions gently con- 
vex, the body whorl often decidedly angular at the shoulder, gently convex 
over the principal part and again more rapidly constricted at about the 
lower third. Aperture large, more than half the length of the entire shell. 
Columella strong, marked by four strong oblique plications or folds in the 
lower part. Surface of the shell marked only by aregular concentric lines 
parallel to the margin of the aperture. 
The shell is known from New Jersey only in the conditions of internal 
casts, and these more or less distorted by compression, so that the characters 
are more obscurely shown than on the examples from Alabama, where the 
shells are beautifully preserved. These casts vary greatly in the height of 
the spire and in the angularity of the body volution, those having higher 
spires always bein g less angular than the short spired specimens. It is pos- 
sible there may be two distinct species among the casts which I have 
referred to this one, but as most of these variations are observable in the 
Alabama examples, I have preferred to class them as one for the present. 
