98 Dr. H. Woodward—On a New Australian Trilobite. 
considered a distinct genus, having characters which, to some extent, 
approach both to Deiphon and Staurocephalus. 
Onycopyge,’ gen. nov. 
Glabella broadly dilated in front, attenuated behind, the genal 
portion reduced to a stout recurved spine, bearing two or more 
short branch spines or tubercles; axis of body-segments narrow, 
arched; pieure straight, well-articulated, recurved at extremities ; 
pygidium channelled, margin indented, armed on each side with 
long-recurved spines, extremity shortly bimucronate. 
I have very great pleasure in dedicating this new Trilobite to its 
discoverer under the name of— 
Onycopyge Liversidget, sp. nov. 
Animal 14 inch in length, by 14 inch wide; surface of test finely 
granulated; glabella spheroidal, broader than long, slightly com- 
pressed in front; eyes nearly concealed beneath the overhanging 
margin of the glabella; cervical lobe narrow; genal portion reduced 
to a long rounded strongly-recurved fixed spine, giving off two short, 
nearly vertical spines or branches (apparently directed forwards and 
upwards)* at a distance of one-fourth and half its length from the 
glabella; there is an indication of a third spine on each side 
directed backwards and inwards; (the facial suture cannot be accu- 
rately determined, but it no doubt ended on the exterior margin, 
as in Deiphon Forbesii, Barr.). Thorax broader than long (fourteen 
millimétres long, by twenty-eight mm. broad), consisting apparently 
of nine joints; axis narrow, convex; pleure united parallel, diver- 
ging at right angles from the axis; each pleura being articulated at 
its fulcral point, which is marked by a small rounded tubercle, 
and having its termination produced as a free recurved spine, the 
length of which increases from the first or anterior pleura to the 
ninth or last. 
The pygidium has its axis extending to its posterior extremity (but 
the surface is broken away) ; the expanded border of the pygidium is 
somewhat deeply excavated into five rounded emarginations, princi- 
pally formed by the two anterior coalesced segments of the pygidium, 
which, springing from the axis on either side, terminate in long and 
strongly-recurved marginal spines; they are separated from each 
other by deep intersecting furrows; behind these we detect indica- 
tions of five coalesced somites; the pygidium terminates posteriorly 
in two short cusps separated by a rounded central emargination. 
The head in Onycopyge agrees most nearly with that of Deiphon, 
the cheeks being reduced in both to long recurved rounded spines ; 
but the glabella is less globular, and the eyes less prominent in the 
former than in Deiphon. The hypostome in Onycopyge, although 
only imperfectly preserved, agrees more nearly with Deiphon than it 
does with Staurocephalus. It is exposed by the abrasion of the 
postero-dorsal surface of the glabella (see Woodcut). 
1 dvuk, ovuxos, a claw; and muy, tail. 
* The extremities of these branches or spines are broken off, so that their length is 
not known. 
