ENTOMOSTRACA OF MINNESOTA. 235 



[Aloua balatonica Daday.] 



This is apparently simply L. acanthocercoides with unusually sharply 

 marked shell. The figures are very poor. 



Leydigria australis Sars. 

 Plate LXVI, Fig. 7. 



Very similar to L. acanthocercokles. 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 AloneUa. 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 AloneUa, but the head is larger proportionally and 

 more horizontal. The lower posterior angle is spined. The an- 

 tennse have seven setie 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, Figs. 8, 11, 12. 



Lynceus testudinarius — Leydig, Lilljeborg. 

 Lynceus reticulaius — 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 antenuc^ 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 



