108 PALEONTOLOGY OF NEW JERSEY. 
either of these genera, if the typical forms are considered, as they are to 
Cithara; therefore I have preferred to place them under this latter genus. 
Formation and locality: In dark green marl near the base of the Lower 
Marls, at Crosswicks Creek, near New Egypt, New J ersey. Collected by 
Dr. N. L. Britton. The casts are very hard, black, shining, and brittle. 
STROMBIDA. 
Genus ROSTELLARIA Lamarck. 
Among the casts of gasteropoda from the Lower Marl Beds in New Jer- 
sey, are several species which appear to belong to this genus, differing from 
those referred to Anchura in not presenting any evidence of a dorsal keel on 
the outer half of the last volution or of spiral striae, and some of them even 
not presenting evidence of vertical folds crossing the upper whorls. Some 
of these are perfect enough to be characterized, while many of them are 
not. Some occur in numbers, while other forms are represented by only 
single individuals. Among those distinct enough for characterization, and 
represented by several individuals, I have considered the following forms 
worthy of notice and description: 
ROSTELLARIA COMPACTA, N. Sp. 
Plate x11, Figs. 18-21. 
Shell of only a medium size or smaller, elongate ovate in form, as casts, 
with a moderately elevated spire, the apical angle of which varies but little 
from 30°; volutions four to five in number, quite compactly coiled and very 
moderately convex between the sutures, presenting evidence of a rather 
thin shell; body volution large, forming nearly or quite one-half of the 
length of the cast; moderately convex on the upper part, but rapidly con- 
tracted below, apparently having been provided with a rostral beak of some 
length; outer part of last volution extended upward at the upper edge to 
near the top of the next volution above, as distinctly indicated on one of 
the casts; aperture, as shown on the cast, narrowly elliptical, acute above 
and pointed below; columellar cavity left by the removal of the shell rather 
small; surface of the cast smooth. 
