247 
from Parara and Curramulka, \ orke Peninsula. The chiif 
point of interest lies in the addition of the genus Obolella 
to the fauna. 
The following are descriptions of the fossils : — 
TRILOBITA. 
Genus Olenellus, Hall, 1862. 
(Fifteenth Annual Report New York State Cabinet Nat. 
Hist., 1862, p. 114.) 
Olenellus, sp. 
(Plate XXV., fig. 1.) 
Obs. — Two species of this characteristic Cambrian Trilo- 
bite are known already from Australian rocks.: — 0. Brownii, 
mihi,* and 0. Forresti, mihi,t with a possible third, 0. '' '^ ) 
Pritchardi, Tate. J The present specimen is very imperfect, 
but sufficient remains to indicate Olenellus rather than Pfycho- 
'paria. It is certainly distinct from Tate's species, and pro- 
bably also from 0. Brownii. 
The cephalon, less the free cheeks, is semi-circular-saggi- 
tate. The glabella oblong, rounded in front, gently convex, 
slightly arched in the middle line (most so anteriorly), and 
with parallel lateral margins ; the axial grooves are strong and 
undulated, to correspond with the glabella furrows : the first 
pair are mere indentations of the axial grooves and hardly per- 
ceptible, the three latter are all complete : the frontal lobe is 
large and subquadrate, the palpebral lobes obpyriform, the 
eye lobes large, flat, crescentic, and extend as far forwards as 
the palpebral, beyond the first pair of glabella furrows, and 
posteriorly to the fourth complete furrow. The free cheeks, 
neck lobe, and posterior portion of the glabella are not pre- 
served. 
There is not sufficient of this cephalon to enable com- 
parisons to be made ; suffice it so say that it certainly is not 
0. (? ) Pritchardi, Tate, provided the illustration of the latter 
is correct, and not a mere conventional figure. The form of 
the palpebral lobes, and complete condition of the glabella 
furrows, so far as they are preserved, also forbid a reference to 
0. Brownii. It is nearest to 0. Forresfi, mihi, from the Cam- 
brian rocks of Kimberley, North-west Australia, possessing 
a similarly elongate glabella, yet not so long as in 0. For- 
resti, similarly long and curved eye lobes, and similar pyri- 
* Etheridge— Contrib. Pal. S.A., No. 9. S.A. Pari. Papers. 
No. 127, 1897. p. 13, pi. i.. fig. 1. 
t Foord— Geol. Mag.. 1890. vii.. p. 99. pi. iv. figs 2, 2a-b. 
+ Tate— Tr.R.S. S.A. . 1892. xv., part 2. p. 187. pi. ii.. fig. 11 
