ENTOMOSTRACA OF MINNESOTA. 85 
The fifth legs of the female are broader proportionally than those 
of lacustris but more slender than those of EL. nevadensis. The last seg- 
ment is four times as long as broad and bears six (7) teeth, of which 
four are terminal. The second, third and fifth segments of the male 
abdomen bear lateral processes extending toward the right. The first 
three segments are subequal. The lateral process of the second has 
the form of a stout but thin lamina projecting to a distance equal to 
the width of the segment; it is acute at the apex, with the pointa 
little recurved, convex and smooth in front, and nearly straight be- 
hind, except that this edge is irregularly serrate throughout and 
deeply emarginate where it joins the segment. This blade is strongly 
curved ventrad like the following. The third segment bears a broad 
thin lamina which projects outward, as wide as long, broadly rounded 
at the end, simple but strengthened beneath by a ridge of chitin. 
From the fourth segment spring two processes, the ventral being 
nearly similar to that of nevadensis. The dorsal process is a small 
irregular plate curving forward, inward and downward. Length of 
female 2.12 to 2.4 mm. 
* Epischura nordenskiceldi Lilljeborg. 
PLATE XI, Figs. 2, 5, 9. 
De Guerne and Richard ’89. 
This species, from St. Johns, Newfoundland, is the largest of the 
genus (2.9 mm.) and is remarkable for the slender, slightly armed ab- 
domen. Cephalothorax robust, abdomen exceedingly slender, four- 
jointed in the female, anterior two somewhat fused, third segment 
longer than the fourth. Caudal stylets twice as long as wide, ciliated 
internally; caudal setze similar and equal. Male abdomen five-jointed 
and slightly flexed toward the right, second and third joints equal and 
half as long again as the first, The second joint is armed with a rather 
small, slightly curved, and notched at the tip. The process of the 
third joint is very small and acute; that from the last is directed 
cephalad and is blunt. Antenne reaching to base of stylets, 25-jointed. 
Geniculate antenna with the penultimate joint unarmed. Feet of 
fifth pair in the female uni ramose, three-jointed, nearly as slender as 
in HL. lacustris though less so than F. fluviatilis, the joints nearly of equal 
length. The left fifth foot of the male closely resembles that of L. 
columbice; the right differing from the other forms in having an acces- 
sory spine near the base of the inner aspect. 
GENUS OSPHRANTICUM Forbes. 1882. 
(=Potamoichetor, Herrick.) 
First reported as Potamoichetor before the Minnesota Academy of 
Sciences in 1879, but owing to a disastrous fire, publication was pre- 
vented. Priority probably belongs to Forbes’ name, since, although 
