236 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 
toward the end, rounded in front; the terminal claws are small and 
have two basal teeth. The dorsal margin of the post-abdomen is coy- 
ered with tufts of hairs. The winter eggs have noephippium. Length 
0.55 mm. to 0.7 mm. The male is smaller and has a lower dorsal keel; 
the post-abdomen is excavated behind. 
The only differences between the Minnesota specimens and the typi- 
cal_European form seemed to be the absence of the very minute spines 
on the front of the terminal claws. The eye and pigment fleck are of 
about the proportions figured by Kurz. Birge’s figure of the post- 
abdomen does not agree with his description fully. Our Minnesota 
specimens have an obvious but not high keel. 
* Graptoleberis reticulata Baird. 
Alona reticulata—Baird, P. E. Mueller. 
Lynceus reticulatus—Lilljeborg, Leydig. 
Alona esucirostris—Schoedler. 
Shell almost rectangular, reticulate, ventral margin straight, ciliate 
anteriorly, with two teeth behind. Pigment fleck smaller than the 
eye. Post-abdomen short, narrowed towards the end, dorsally cov- 
ered with clusters of spines; caudal claws with a minute tooth at the 
base. Length 0.4 mm. to 0.5 mm. 
The pigment fleck is nearer the end of the beak than the eye, and 
is smaller than in the previous species, but, on the whole, there is, 
perhaps, too great similarity. 
Professor Birge writes that he unites the two species. 
GENUS DUNHEVEDIA King. 
Crepidocercus — Birge. 
The characters of this group place it rather near Alonella or between 
that and Pleuroxus. Form sub-quadrate with rounded angles; dorsal 
line uniformly arched, terminating in a sharp angle behind; lower 
margin convex, armed behind with a single spine as in Pleuroxus 
unidens, and along the entire length with loose sete. Beak of moder- 
ate length, acute. Post-abdomen deeply incised in the anal region; 
lower posterior margin straight,rounded at the apex; ventral margin 
straight or concave; claws with a single basal spine and a few teeth. 
The post-abdomen is shoe shaped and armed with transverse rows of 
sete. 
The antenne are large, having eight sete and the usual spines. 
Shell smooth or reticulate. Founded by King to include two species 
from Australia, D. crassa and D. sodagra. 
4 
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