156 PALEONTOLOGY OF NEW JERSEY. 
label found with this one indicated no locality, but from the character of 
material it would appear to have come from Mullica Hill, New Jersey, and 
consequently would pertain to the Lower Marl Bed. 
ACTON GABBANA, 0. Sp. 
Plate x1x, Figs. 23-25. 
Acteonina biplicata (M. & H.) Gabb: Proc. Acad. Nat. Sci., Phila., 1860, p. 93, 
Pl. um, Hig. 13: 
Solidula biplicata (M. & H. sp.) Gabb: Synopsis, p. 38. 
Solidula biplicata (Gabb) Meek, Check List Cret. and Jur. Foss., p. it; Geol. N. 
J., Newark, 1868, p. 728. 
Acteon biplicata (Gabb sp.) Meek: U. S. Geol. Surv. Terr., vol. 9, Invert Pal., pp. 
281, 282. 
Shell of medium size, elongate ovate or subcylindrical in outline, spire 
moderately elevated, entire length and number of volutions unknown. 
Body volution cylindrical in the upper half, obtusely rounded below. Ap- 
erture narrow, pointed and very contracted above and rounded below, about 
four-fifths as long as the length of the body volution, measured on the same 
side. Columella slightly twisted below and marked by a single tooth near 
the base, as determined by the groove showing onthe cast. Surface of the 
shell marked by fine spiral lines, the number undeterminable from the speci- 
mens examined. 
The species is known only from two individual casts, both of which 
appear to have been used by Mr. Gabb in his original investigations. I 
can not, however, ascertain the existence of more than a single tooth on 
the columella from the specimens, as they show only a single groove left 
by the removal of the substance of the shell. The specimens are also both 
imperfect in the upper part of the spire, so that the entire height is not 
ascertainable. The shell is, however, so distinct in its proportion from any 
other from the New Jersey formations, that there is no chance of confound- 
ing it with them. There appears to have been some confusion in the author’s 
mind in regard to the specific relations of this shell, when the name 
Actonina biplicata was applied; and also subsequently, as he refers it to a 
species described by Meek and Hayden from Nebraska. These latter 
