80 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 
angular and armed with fine serrulations on its inner margin. The 
inner ramus is one-jointed, equaling in length the first joint of the 
outer ramus. 
‘The left fifth foot of the male reaches slightly beyond the first joint 
of the outer ramus of the right. The basal joint is quadrangular, con- 
siderably shorter than the right basal joint. The first joint of the 
outer ramus is about twice as long as broad. The second joint is 
slightly longer than the first joint; it is‘expanded at base, where it is 
armed with fine hairs, and terminates in a-finger-like process bearing 
a falciform spine. The inner ramus extends to about one-half the 
length of the second joint. Length of female, 1.5 mm.; male, 1.3 mm. 
‘‘The material in which this species was found was collected by 
Professor E. A. Birge at New Lisbon, Wisconsin, and only a few indi- 
viduals were found. I have expected to find it in the collections from 
other Wisconsin localities; but so far my search has been without suc- 
cess. It isa clearly marked species resembling the European D. gracilis 
Sars more closely than does any other described American species. The 
characters of the fifth feet, however, separate it from the Kuropean 
form. 
‘‘T have taken the liberty of naming this species in honor of Profes- 
sor Birge, to whose kind assistance and encouragement I have been 
greatly indebted.”’ 
GENUS BROTEAS Loven. 1845. 
Thorax five-jointed. First antennz multiarticulate; second pair 
bi-ramose. Swimming feet four pairs, bi-ramose, outer ramus three- 
jointed, inner two jointed; fifth feet dissimilar in the sexes. The third 
pair of maxillipeds falciform. Abdomen of the male six-jointed, in 
the female two jointed. The single known species, Bb. falcifer Loven 
(Plate X, Fig. 16), a large slender form (4.0 mm. long), occurs in salt 
pans near Port Natal. 
GENUS HETEROCOPE Sars. 1863. 
Cephalothorax six-jointed; last thoracic segment more or less divari- 
cate alike in the two sexes. Abdomen of female three-jointed, of the 
male five-jointed. Caudal stylets; larger sete three. Antenne 25- 
jointed; in the male right antenna a geniculating joint between seg- 
ments 18 and 19, the six preceding somewhat tumid. Swimming feet 
four pairs, of which the outer rami three-jointed, the inner one- 
jointed. Fifth feet of female simple, three-jointed, those of the male 
dissimilar; the left cheliform. Abdomen of the male symmetrical. 
Heterocope is obviously the eastern homologue of Epischura. 
The three species of this genus may be tabulated thus, following 
De Guerne and Richard: 
ea 
