470 MARGUERITE HENRY. 
the terminal segment of the inner branch. The lip-plate 
is somewhat triangular in form. 
The tail-piece (fig. 4) is moderately long and broad; the 
supra-anal angle is distinct but somewhat blunt. There 
are no spines present on the infra-anal margin, but above 
it is a row of about eleven bundles of fine spinules of which 
the outermost are longer and larger than the rest. The 
end-claws are situated on a prominence; they are very long,. 
straight for the greater part of their length, with gently 
curved tips; each bears two denticles, one at the base and 
one finer than the other about the middle of its length; 
there is a row of spinules between these two denticles. 
This species resembles most nearly Acroperus harpce 
Baird, described in the “‘Natural History of the British 
Entomostraca.’’) The general shape is different; the head 
comparatively smaller, the eye and ocellus larger and not 
so far removed from the dorsal margin. The depression of 
the posterior edge as seen in A. harpeoe is absent. The 
antennule has no long sensitive papilla. 
Specific Characters.—Carapace, seen laterally, truncated 
oval; dorsal margin arched, ventral edges of the valves. 
convex in front; posterior edges slightly curved, oblique. 
Postero-ventral angle armed with two denticles. Head 
bent down, rostrum blunt. Hye moderately large, ocellus 
slightly smaller. Antenne reaching nearly as far as the 
tip of the rostrum. Surface of the carapace obliquely 
striated. Tail-piece provided with eleven comb-like bundles 
of spines, end-claws long, each with two denticles and a 
row of spinules. Two eggs present in the brood-pouch 
lying side by side. Average length 0°62 mm. 
Locality.—Collected at Port Stephens, Kendall and Cum- 
balum in the spring and summer months. Type specimen 
in the Australian Museum, No. P 4328. 
