G. M. Txromson.—On the New Zealand Entomostraca. 261 
It is with considerable hesitation that I advance the above as distinct 
species. As Sir John Lubbock states (Linn. Soc. Trans. Vol. XXIV., p. 206), 
the relative length of the carapace and the form of the caudal lamella vary 
so much in different individuals, even when taken from the same pool, that 
they do not constitute good characters on which to found new species. 
Though the specimens examined by me were sufficiently distinct to be 
readily recognised and separated into two lots without any close investiga- 
tion, yet Iam inclined to think that both constitute only varieties of a 
wide-spread species. In fact, I should be inclined to include under one 
species, L, productus, Bose., from Europe, L. viridis, Baird, from Tasmania, 
L. angasii, Baird, from South Australia, and perhaps even L. glacialis, 
Kroyer, from North America. 
Order II. Cladocera. 
Legs four to six pairs, chiefly branchial; eye single and very large ; 
antenna two pairs, inferior large, branched, and adapted for swimming. 
Fam. I. Daphniade. 
Superior antenna small; inferior large, two-branched; legs five (or six) 
pairs, all enclosed within the carapace. 
Genus I. Daphnia, Müller. 
Head produced downwards into a more or less prominent beak. Superior 
antenne exceedingly small, one-jointed, and situated under the beak; 
inferior large and powerful. 
1. Daphnia obtusata, nov. sp. Fig. E.2 a-e. 
Carapace (viewed laterally) oval, broadest below the middle, obtusely 
pointed below, infero-anterior margin oblique; anterior margin rounded, 
finely ciliated. When viewed dorsally, the valves are narrow-obovate in 
shape, tapering downwards. Head small, produced into a very obtuse 
eak. Inferior antenn® comparatively small as compared with European 
species, not more than one-fourth the length of the carapace. Superior 
antenne very minute, thick and slightly curved, with a few very delicate 
cilia at the extremity. Eye moderately large. Abdominal segment bearing 
two slender filaments. Caudal claws long, slender and curved, serrated 
below. Lower edge of abdomen with numerous curved tee 
The whole carapace is semi-transparent and closely striated. 
Length > inch. Occurs in great abundance in still water in neigh- 
bourhood of Dunedin from October to May. 
The young are very abundantly produced, over thirty sometimes occur- 
ring within the valves of the parent. Before leaving this shelter they are 
remarkably well-developed and able to swim about freely. At this early 
stage the carapace is subquadrate in shape, and both pairs of antenne are 
relatively large, the inferior being nearly as long as the animal. 
