On Australian Entomostracans. PASS 
appears to have been the first to classify these animals 
under separate generic names. The only remark that I 
feel justified in making is, that I think the name Lynceus 
ought to have been retained for one of the genera. The 
Australian species known to myself may be referred to 
four genera, 
Genus Eurycercus. (Baird.) 
**Carapace generally subquadrangular. Abdomen very 
broad, in the form of a flat plate, densely serrated. Beak 
short, slightly curved downwards.” 
This is Baird’s description, drawn up from a single 
species. My Australian species do not quite accord in all 
points with it, although they do agree with it in that 
important particular whence the name is taken. 
(1.) £. spinosus. (Plate VII. D.)—The head is large, 
the dorsal margin is rounded, the anterior nearly straight 
throughout the greater part of its length, and ciliated. 
The carapace is striated obliquely. The inferior antennz 
(which I shall call Rami, being throughout the family the 
main organs of progression), are large, and have a short 
spine at the extremity of each joint of the posterior 
branch, and at that of the third there are also three sete, 
two only of which are jointed. The first joint of these 
setze is produced beyond the articulation of the second into 
a short spine. The anterior branch wants the spines on 
the first two joints, but is furnished with the same number 
of setze and a spine at the extremity of the third joint. 
The last segment of the abdomen is broad and short, the 
extremity rounded and serrated. 
Habitat.—A small pond at the side of the road between 
Sydney and Liverpool. 
(2.) E. Cunninghami. (Plate VII. A.)—Carapace oval : 
dorsal and anterior margins rounded, the latter ciliated. 
