GASTEROPODA OF THE LOWER GREEN MARLS. W597 
gentlemen, however, disclaim the responsibility of the name, and as none 
such appear in any of their works, we can only conclude that Mr. Gabb 
was in some way confused, as suggested by Mr. Meek in his Invert. Pa- 
leont. of the Territories, that Mr. Gabb intended to refer it to A. attenuata; 
but it certainly is a very distinct species and can never have had so ele- 
vated a spire as that one. As the name 4d. biplicata has been previously 
used by D’Orbigny for a very distinct species, and as this one appears to 
be a true Act@on, I see no way to avoid a change of name in this case, 
and therefore propose the name Acteon Gabbana as a substitute for that 
used by Mr. Gabb. 
Formation and locality: In the Lower Green Marls. The specimen is 
labeled “Tinton Falls, New Jersey,” and is from a green marl, and may 
have come from below the middle marl bed at that place. In the col- 
lection Acad. Nat. Sei., Phila. 
ACTON FORBESIANA, n. sp 
Plate x1x, Figs. 17-22. 
Tornatella, Lyell and Forbes: Quart. Jour. Geol. Soc., London, vol. 1, 1844, p. 63, 
Fig. c. 
Shell of about a medium size for the genus, broadly ovate or ovoid 
in outline, spire short, obtusely rounded, middle portion of the shell sub- 
eylindrical and the base obtusely pointed, having nearly the same angle 
as that of the spire. Volutions from four to five in number, closely coiled 
and rising but slightly one above another; body volution very slightly 
chamfered just below the suture, presenting an almost imperceptible angle 
a little below the suture, below which it is nearly cylindrical to below 
the middle of its length, and obtusely pointed at the lower extremity. 
Aperture two-thirds the length of the shell, and considerably longer than 
the diameter of the body volution, very narrow at the upper part, but 
gradually widening below, rounded in front. Columella comparatively 
strong, bearing a single oblique ridge near the middle of its length, and 
having the margin thickened below it, and around the base of the aper- 
ture, as seen by the impression of these features on the internal casts. 
Surface of the casts marked by rather fine, closely arranged, spiral lines, 
