187 
ridges become less prominent and the marginal areas less arched, 
Surface very finely and closely wrinkled-striate transversely. 
Length.—25 mills. 
Locality.— Cambrian limestones at Curramulka. 
TRILOBITA. 
Dolichometopus Tatei, H. Woodward. 
Geological Magazine, August, 1884, t. x1., fig. 3, p. 343. 
Conocephalites australis, H. Woodward. 
Op. cit., t. xi., figs. 2a., 20. 
Olenellus (?) Pritehardi, spec. nov. Plate ii., fig. 11. 
Head broad, semicircular in outline, about 15 mm. broad, and 
8 mm. long, slightly convex ; margin rather broad and continuous 
all round, separated about midway from the glabella and cheeks 
by a narrow low ridge; glabella oblong, slightly convex, ill- 
defined by a groove; eye-lobes crescentiform, narrow, elongate, 
arching from the base and becoming confluent with the glabella 
near its summit; the area between the glabella and eye-lobe is 
slightly depressed, broad and subdeltoid. 
The absence of glabella-furrows and the uncertainty of the 
presence of genal spines render doubtful the generic location of 
this trilobite, which is named after Mr. G. B. Pritchard, whose 
zeal as a collector has so largely enriched our knowledge of the 
Cambrian fauna of this province. 
Mierodiseus subsagittatus, spec. nov. Plate ii., fig. 12. 
Head obtusely sagittate-triangular, about 7 mm. broad and 
long ; the glabella is oblong, strongly convex, obtusely-rounded, 
but not narrowed in front, one slight furrow crosses its posterior- 
third, posterior to which it is narrowed. 
Cheeks slightly overhanging the outer marginal groove. 
The shape of the head serves to distinguish this species from 
all others to figures of which I have had access. 
Gen.? Spee.? Plate ii., figs. 9 and 13. 
I figure two very distinct free-cheeks, each having a genal 
spine, which cannot be referred to any associated species of which 
the heads are known. Up to the present no glabella without the 
cheek-pieces have as yet been found. 
It is also noteworthy that the remains of trilobites consist 
solely of heads, of which a considerable number has been collected, 
neither body-rings nor tail-pieces having yet been discovered. 
ENTOMOSTRACA. 
Leperditia, spp. 
The presence of this genus is indicated by the occurrence of 
two species, one, which has much resemblance to LZ. dermatoides, 
