ENTOMOSTRACA OF MINNESOTA. 235 
[Alona balatonica Daday. | 
This is apparently simply L. acanthocercoides with unusually sharply 
marked shell. ‘The figures are very poor. 
Leydigia australis Sars. 
PLATE LXVI, Fig. 7. 
Very similar to L. acanthocercoides. Head comparatively erect, 
rostral projection not much curved. Body quadrangular, expanded 
behind and obliquely truncate. Macula nigra at least three times as 
large as the eye. Antennules reaching nearly to the end of the beak. 
Abdomen very large, lamellar. Spines about 20, increasing distad. 
Length 0.84 mm. 
The points most relied on to distinguish the species are the large 
size of the macula and the absence of teeth from the claws. A very 
full description with numerous figures is given by Sars. 
GENUS GRAPTOLEBERIS Sars. 
A genus having affinities with Alonella. The shell is entirely re- 
ticulated, and there is a sort of crest along the back; while, on the 
other hand, the head is flattened and rounded in front. There can 
hardly be said to be a beak. Seen from above, the animal resembles 
some species of Alonella, but the head is larger proportionally and 
more horizontal. The lower posterior angle is spined. The an- 
tenne have seven sete and are very long, in this respect resembling 
Camptocercus. The dorsal contour is not greatly arched. The post- 
abdomen has short claws and anal bristles, but no teeth. 
* Graptoleberis testudinaria Fischer. 
PLATE LXV, Fias. 8, 11, 12. 
Lynceus testudinarius—Leydig, Lilljeborg. 
Lynceus reticulatus—Fric. 
Alona testudinaria—Schoedler. 
Graptoleberis inermis—Birge. 
Form trapezoidal; lower margin straight, armed behind with two 
teeth, thickly beset with long hairs in front; the dorsal margin is not 
greatly elevated, rounded at the posterior angle, forming a slight 
“hump” where it unites with the head shield. The head and shell 
are reticulated with hexagonal or quadrangular markings. The shell 
gapes below and rises to a sharp ridge above. The antenne have long 
rami, the antennules being hardly longer than the fornices. The eye 
is large; the pigment fleck is small. The post-abdomen is narrowed 
