PROCEEDINGS OF UNITED STATES NATIONAL MUSEUM. 151 
ones (about 24 on the body-whorl); two very distinct revolving lines on 
the last volution, the upper one placed at about the middle, the lower 
one subcarinating it (only the upper of these two lines is seen on the 
remaining whorls, appearing there as a central line); base striated by 
revolving lines, and radially by the continuations of the transverse 
lines; apperture elliptical, somewhat produced distally. 
Length, 2? inch. (No. 8920.) 
Jackson, Miss. 
FUSUS, Lam. 
Subgenus STREPSIDURA, Swainson. 
FUSUS MARNOCHI, n. sp. 
Plate, fig. 6. 
Volutions seven or eight, the earlier three or four convex, the remain- 
der flattened; body-whorl subangulate; suture impressed; aperture 
less than one-half the length of shell, the canal sharply twisted; col- 
umella with a pseudo-fold following the curve of the canal. The whorls 
in the single specimen before me are destitute of ornamentation, but 
some traces of the former existence of revolving lines are apparent. 
Length, # inch. (No. 8917.) 
Atascosa County, Texas. 
Named after Mr. G. W. Marnoch, through whom this and other spe- 
cies of older Tertiary Texas fossils have been obtained. 
TEREBRA, Lam. 
TEREBRA PLICIFERA, 0. Sp. 
Plate, fig. 8. 
Turreted; whorls ? in number, flattened, rapidly decreasing in size 
from the base upwards, and ornamented by numerous broad and prom- 
inently defined plice, having a sigmoidal flexure; an impressed line on 
the upper portion of each volution produces a subsutural ring or band, 
over which the plice and corresponding sulci are continued, and which 
occasionally tends to become double from the presence of a second im- 
pressed line. Body-whorl with two elevated revolving lines on its basal 
angulation; base radiately and longitudinally striated; aperture? (bro- 
ken in all specimens). 
Length? (No. 8919.) 
Atascosa County, Texas. 
CRASSATELLA, Lam. 
CRASSATELLA DECLIVIS, 0. sp. 
Plate, fig. 9. 
Very inequilateral, somewhat inflated anteriorly, the posterior dorsal 
margin descending very obliquely to the extremity, which is subcunei- 
