GASTEROPODA OF THE LOWER GREEN MARLS. 107 
by Dr. Britton, and one cast from the collection of Mr. Joseph McFarland, 
of Philadelphia. . 
CITHARA CROSSWICKENSIS, 0. sp. 
Plate x11, Figs. 7, 8. 
Shell of moderate size or larger, subfusiform or turriculate, the spire 
as long as or longer than the length of the body volution and beak, only 
moderately slender, the apical angle being about 30° to 35°, and the num- 
ber of volutions probably about five; all the specimens being imperfect 
and mostly casts, the exact number can not be determined; body volution 
large in proportion to the others, quite ventricose in the upper part and 
contracted below to form the short beak; upper volutions only moderately 
ventricose; suture, in the casts, strongly marked and the volutions rather 
abrupt on the upper margin; aperture large, angular above, and more 
sharply so below; columella strong, leaving a moderately large cavity by 
its removal, which, in the most perfectly formed cast, shows evidence of a 
single, rather strong, oblique plication on the lower part; volutions marked 
by distant, strong, and angular vertical folds, extending from the suture to 
near the base of the beak on the body volution, and from suture to suture 
on the others, even on the casts; surface of the shell marked by very fine 
transverse strize parallel to the folds, which are only slightly directed for- 
ward in their lower part; and by extremely faint indications of faint thread- 
like, raised, spiral lines, divided by broad flattened interspaces. 
The specimens upon which this species is founded are partially casts, 
with the shell preserved on a portion of the body volution of one of them. 
Its substance is very thick and the vertical folds sharply angular. The 
species bears a very close resemblence to C. Mullicaensis herein described, 
but the shell is larger and has a more elevated spire, while the body whorl 
is larger in proportion, the spire more slender, and the sutures much more 
‘distinct. The surface characters are much the same in both. There may 
be some question as to the proper generic reference of the species C. Mul- 
licaensis, but the specimens are in such a condition of preservation that it 
is impossible to tell just what they are. Stoliezka, in the Pal. Indica, refers 
very similar forms to Volutilithes Swains., and others, just as similar, to 
Lyria Gray, but it does not seem to me that they are as nearly related to 
