ENTOMOSTRACA OF MINNESOTA. DAT 
diocres gerenti, postice angulum obtusum, inermem formante; cauda brevi, apicem 
versus rotundatum dilatata, margine dorsali utrinque serie marginali aculeorum 
7-8 sensim minorum et pleuribus minimorum equalium armata; unguibus caudali- 
bus inermibus dente basali uno. Longit. fem., 0.4—0.48; alt. 0.18-0.22 mm.”’ 
While doubting the integrity of this species we are unable to place 
it and quote the author’s description. 
Alona elegans Kurz. 
PLATE LXII, Fig. 14. 
Form rectangular; back slightly elevated, posterior margin high, 
lower margin straight. Shell covered with minute striations spring- 
ing from the region of the attachment of the head shield. Head 
rather large, pigment fleck smaller than the eye. The antenne have 
eight sete anda circlet of spines on the second joint of the inner 
ramus, and a single thorn on its first joint. The post-abdomen is 
short and broad, rounded at the end, and is armed with about ten 
anal teeth and a lateral row of scales. Length 0.4 mm. to 0.5 mm. 
* Alona angulata Birge. 
Dorsal margin considerably arched, terminating in a more or less 
obvious angle at the hinder corner; the hinder edge is convex, as is 
also the front margin; the ventral margin bears plumose sete. Beak 
pointed, extending nearly to level of ventral margin of the valves. 
FYornices broad. Shell obviously striated diagonally and less obviously 
marked by cross lines. Post-abdomen broad, truncate; about twelve 
anal teeth, with a series of scales and hairs back of them. The pig- 
ment fleck is much smaller than the eye. Male smaller; beak shorter; 
post-abdomen with a lateral row of hairs; anterior feet hooked; 
sculpture less distinct. [Birge.] Length of female 0.4 mm.; male 
0.35 mm. 
Whether Professor Birge still continues this species does not ap- 
pear, but it is dropped from the list of Madison Cladocera. 
Alona coronata Kurz. 
Hellich identifies this with his A. pulchra, but with Matile we re- 
gard this as doubtful. The resemblance to A. pulchra [lineata] is very 
close, the outline being identical. The lower margin is sparsely 
hairy. The beak is blunt. A half circlet of teeth ornaments the end 
of the middle segment of the inner ramus of the antenne, The macula 
is but little smaller than the eye. The post-abdomen is broad as in 
A, elegans, not narrowed at the end, but broadly rounded. The anal 
