262 On Australian Entomostracans. 
(Plate VIII. E.), an Entomostracan, which bears a remark- 
able resemblance in one respect to Mr. Baird’s Plewrowus 
hamatus. It was accidentally compressed too much to allow 
it to resume its original form, and I was without a micro- 
scope to examine further. I therefore figure the animal 
asit appeared. Baird thought that his Plewroxus hamatus 
was a male form, because of the two hooks on the first 
pair of feet. 
Habitat.—In the South Creek at Dunheved, May, 1852. 
Description of the Plates. 
Plate VI. A. Daphnia carinata; var. gravis: one of its 
endless varieties. 
B var. cephalata. 
C. Elizabethe ; var. acuti-rostrata. 
D honorata ; male, b. the superior 
antenne. 
i. mucronata, (Miiller.) 
F. Macrothrix spinosa; b. articulation of 
the long seta of ramus; c. 
last segment of the abdomen. 
G. Part of the nervous system of 
D. carinata ; showing the following parts: a. the eye; 
b. the optic ganglia; b’. the nerve connecting them with the 
central nervous mass or brain; c.c. the muscles moving the 
eye; d. the black spot; e. the point of attachment tothe inner 
side of the carapace of the nerve which carries the black 
spot; f. a short nerve attached at the extremity to the 
carapace; g. nerve leading to the superior antenne ; h. 
commencement of the labrum; k. point of attachment of 
the head to the body; 1. the cesophagus; m. m. the intes- 
tine ; n.n. the two coeca; p., p. p. place of attachment of 
