GASTEROPODA OF THE LOWER GREEN MARLS. 61 
TRACHYTRITON ? MULTIVARICOSUM, N. Sp. 
Plate v, Figs. 12, 13. 
Shell of medium size and rather ventricose, with an elevated spire, 
which is composed of rounded and ventricose volutions, and has an apical 
angle of about 50°; volutions four and a half or five in the cast, the 
number not definitely known, the specimens being impertect at the apex; 
sutures very distinct and marked; body volution proportionally large 
and full, especially in the upper part, and slightly extended below;-the 
beak rather long, 
aperture large, elongate-elliptical, acute above and extended below, the 
slightly twisted, and provided with a rather large canal; 
length about three times the width; columella, as shown by the cavity left 
by its removal, rather strong and perfectly smooth; surface of the cast show- 
ing remains of numerous closely arranged, vertical folds marking the upper 
portion of the volutions, but becoming indistinct on the outer half of the 
Jast one; three of these on each yolution shghtly stronger than the others; 
also, marked by spiral lines or ridges, which have left deep grooves on the 
inner surface of the volution$ of the cast, and also mark the outer half of 
the body whorl, becoming quite distinct’on the margin of the lip, indicat- 
ing crenulations or denticulations on its inner surface. 
This species differs from TJ. Atlanticum, herein described, in its more 
robust form, rounder volutions, and more numerous vertical folds, and the 
anterior beak and canal seems to have been longer and more slender, and 
also somewhat twisted. In its general appearance it more nearly approached 
T. vinculum Hall and Meek! (sp.), from the western Cretaceous, but the 
spire has been shorter, and the lower part of the body volution contracts 
more abruptly. 
Formation and locality: In the blackish layers of the Lower Green 
Marls at Crosswicks Creek, New J ersey, Collection at Rutgers College. 
' Hall and Meek, Mem. Am. Acad. ‘Arts and Sci., vol. 5, 0. 8 
