= 
<. * 
94 * DestNpiion ae New Specie of Fossil Shells. - 
men, I cannot tell whether this is a constant character or not. It 
resembles the P. sulcata, Lea, in its furrows, but differs _ it 
in other respects. 
FAMILY PLICACEA. 
. Genus Actmon.—Montfort. ; 
A. levis. Pl. 1, fig. 4. 
A. testa subulata, polita, levi, tenui ; spira valdé elevata; an- 
fractibus , planulatis; suturis impressis; columella unipli- 
cata; apertura quadrilaterali. 
Shell subulate, smooth, polished, thin; spire very elevated; 
. “whorls , flat; sutures impressed ; columella with one fold; 
mouth Siictctiatar 
# 
Length Breadth -05 of an inch. 
Remarks.—This interesting little species somewhat resembles 
A. elevatus, Lea, but differs sane it in having but one fold on the 
columella, in the shape of the mouth, and in size. The fold 
on the columella is unusually large for so small a shell. It is the 
most subulate Actzon that I have seen. 
A. magnoplicatus. Pl. 1, fig. 5. : 
A. testa turrita, subcrassa, levi, polita; anfractibus , pla- 
nulatis; suturis impressis; columella uniplicaté, plic& magna, 
acuta; labro acuto; apertura ovata, sub-effusa. 
Shell turrited, somewhat thick, smooth, polished ; whorls ——, 
flat; sutures impressed ; columella with one large sharp fold; 
Mouter lip sharp; mouth ovate, somewhat effuse. 
Length Breadth. -07 of an inch. 
Remarks.—This little shell is remarkable for its large elevated 
fold, which is placed in the middle of the columella. The last 
whorl is angular below. The mouth is .05 of an inch in length. 
I have but a single whorl of a specimen of this species, but that 
presents characters so different from those of any species that I 
have seen, that I have no hesitation in pronouncing it to have 
been hitherto undescribed. This makes the eleventh Acte#on 
described from the tertiary at Claiborne. The striatus described 
by my father, has been changed by him to alveatus, the former 
name having been pre-occupied by Mr. Sowerby. 
