418 A Geological Section at Todd's Fork, 0. — Foerste. 
border, so as to meet the right edge of the body. Along this curved por- 
tion are three, rather stout, and fairly rounded, but not markedly promi- 
nent teeth. The remaining teeth form a straight row, are much flattened 
laterally, are directed backward, and decrease gradually in size posteriorly. 
Owing to the position of the teeth, the anterior t«^eth of the row, which are 
in reality about as prominent as those of the middle portion, appear as 
mere undulations in the drawing. A series of undulations extend along 
the left side of the fossil, the grooves of which run from the teeth to the 
not very distinct marginal rim. Named in honor of Dr. S. M. Austin. 
EUNICITES FALCATUS, Sg. U. 
Fig. 5. 
This species is likewise very distinct from any species hitherto described.. 
It consists essentially of a sickle-shaped fossil, moderately curved behind, 
decidedly incurved anteriorly, and lined with a series of teeth, all of which 
are directed backward. The teeth are all flattened laterally; the first 
three, owing to the curvature of the shell, form a set quite by themselves, 
being almost at right angles to the main set of teeth along the side. A 
tooth at the beginning of the sickle-shaped curvature has an intermediate 
position, being at the same time the largest tooth, from which point the 
teeth decrease regularly in size,— rapidly along the anterior curve, gradu- 
ally toward the posterior extremity. A narrow margin extends along the 
base of the fossil. The fossil is 2 mm. long. 
EUNICITES CONFINIS, Sp. Tl. 
Fig. 6. 
This fossil, in many respects, is so much like Lumbriconereites triangu- 
laris Ilinde, that it might almost have been considered as a tooth from the 
mouth of the same animal, and immediately contiguous to the same, had 
there been evidence of the unserrated parr, folding back upon the tooth 
along its posterior extremity. The depression at the base of our form is 
also unnoted in Hinde's species, nor have we the elevated ridge extending 
from the middle teeth to the opposite basal angle. Otherwise there is con- 
siderable similarity. The first two teeth appear broken, and not in line 
with the rest, the body of the tooth being concavely curved anteriorly. 
Then follow four teeth at moderate distances apart, of which the first two 
are probably injured. The remainder of the teeth are closely set, and 
smaller, rapidly decreasing in size posteriorly. The posterior part of the 
fossil is convexly bent so that there may once have been a recurved portion 
attached, but there was no evidence of its existence visible. A ridge runs 
along the posterior half just beneath the teeth; a broad longitudinal de- 
pression occupies the remainder of the surface. The tooth is 2. 3 mm- 
long. 
EUNICITES PAULULU8, Sp. Tl. 
Fig. 7. 
This fossil is very small, .6 mm. in length. It is broadly triangular in 
outline as in the last species described. Anterior to the basal angle is a 
semicircular notch which may have been accidental. The first tooth of 
the series is fairly prominent, the next three are quite small, the next threfr 
