On Paleozoic Bivalved Entomostraca. 243 
which it differs in the following particulars :—the prolonga- 
tion of the head is not prominently and dentately spined, as 
in Westwood’s species, but only obtusely spined, thus giving 
the head a much more slender appearance, the spines in both 
species being arranged in six longitudinal series, two above, 
two beneath, and one on each side ; the black spotting is also 
much more minute, and the colour of the dorsal surface of the 
abdomen different. 
I have received P. nobilis both from the Malay peninsula and 
Sumatra, whilst Java thus produces a distinct though closely 
allied species. 
Pyrops mustelinus, 1. sp. 
. Body and tegmina above and beneath ochraceous, the head, 
pronotum, scutellum, sternum, and tegmina minutely black- 
spotted; tegmina with the veins reddish ochraceous; anal 
appendage black, thickly margined with white pile. Wings 
pale creamy white, the veins pale ochraceous. Femora 
ochraceous, annulated with black near apex, and with a few 
small black spots between the annulation and base; tibize 
more or less black-spotted, tarsi with the apices of the joints 
more or less fuscous. 
Exp. tegm. 55 millim., long. cap. 144 millim. 
Hab. Java. 
This species is allied to the Indian P. punctatus, Oliv., 
from which it differs by the much more prolonged head, the 
apex of which is not distinctly curved upwards, and which 
is also more spotted with black than in Olivier’s species; the 
abdomen above is ochraceous, and not black, &c. 
XXIX.—WNotes on the Paleozoic Bivalved Entomostraca*.— 
No. XVI. By T. Rupert Jones, F.R.S., F.G.S8., &c. 
[Plates VI. & IX. | 
I. Some Paleozoic and other Bivalved Entomostraca from 
Siberian Russia. (Pl. VL.) 
In the summer of 1882 Professor A. Karpinsky, of the Mining 
Institute at St. Petersburg, asked me to examine and report 
* Notes No. XV. appeared in the Ann. & Mag. Nat. Hist. for November 
1882, ser. 5, vol. x. pp. 858-360. 
