258 PALEONTOLOGY OF NEW<YORK. 
311. 2. OLENUS UNDULOSTRIATUS (xn. sp.). 
Pu. LXVII. Figs. 3 a, b. 
Compare Olenus spinulosus, DALMAN. 
Buckler semielliptical or sublunate, the posterior angles extended into diverging spines ; 
eyes lunate; glabella (apparently not lobate) marked by fine ruge ; facial suture extending 
from the margin of the cephalic shield, in front of the eye, to the base of the same, distant 
from the angles; articulations slender, those of the lateral lobes grooved. 
The single fragment figured, is all that has been seen of this species. The character of 
the buckler, form of the eye, and direction of the facial suture, induce me to refer it to 
the Genus OLENvs. It is, in many respects, analogous to the preceding species, but is too 
obscure to decide whether the glabella is lobed or not. The segments of the thorax are 
imperfect, and the extremities are not preserved. 
Fig. 3 a. The fragment, natural size. 
Fig. 3 5. A part of the same enlarged, showing the course of the facial suture, and the rugose striated 
glabella. 
Position and locality. This specimen was obtained at Snakehill, Saratoga lake, in the 
soft olive shales, associated with other species belonging to this group. —_ (State Collection.) 
312. 1. AGNOSTUS LOBATUS (n. sp.). 
Pu. LXVII. Figs. 5 a -/f. 
Minute, trilobate, with a narrow border around the base and sides; middle lobe often 
with a small tubercle near its larger extremity. 
This species bears considerable analogy to the Swedish specimens from a similar geo- 
logical position, but they are not identical. Our species is always smaller, and I have never 
seen the small node or tubercle at the base of the central lobe; but it presents a similar 
character on the other extremity. All our specimens have the appearance of the caudal 
shield of a small trilobite, and two or three individuals are apparently articulated. 
Figs. 5 a, b. Individuals of the natural size. 5 c,d, The same magnified. 
Figs. 5 e, f. Specimens showing an articulation of the lobes. 
Position and locality. This peculiar little fossil has been found only in some calcareous 
beds, intercalated with the shales of this group, one mile east of Troy. I am indebted to 
Dr. Sxizron of that city for good specimens of the same. (State Collection.) 
