ENTOMOSTRACA OF MINNESOTA. 81 



I. Antennte shorter than the body. Stylets armed at the angle with 

 a short non-ciliated seta. The female has no appendages at the 

 genital orifice. The last segment of fifth foot on the right side 



of male short saliens and boreaiis 



II. Antennse longer than the body. Stylets without the setae at the 

 angle. Female with eight appendages at the genital orifice. 

 Last joint of the male right fifth foot long and straight. . . appeadiculata 



Heterocope saliens Lilljeborg. 1862. 

 Plate X, Fig. 14. 



Last segment of the fifth feet of the female short and broad, teeth 

 of its internal aspect distinctly bifid. The prolongation of the inner 

 aspect of the antepenult joint of the left fifth foot of the male incurved, 

 not reflexed at its end. 



Heterocope boreaiis Fischer. 1851 

 Plate X, Fig. 15. 



Last segment of the fifth foot of female long and straight, teeth less 

 distinctly bifid or trifid. Prolongation of male left foot much curved 

 and reflexed at the end. 



Heterocope appendiculata Sars. 1863. 



Plate XI, Fig. 3. 



Two other species, II. alpina and H. romana, have been described 

 by Imhof {'88). These forms remain imperfectly known and may be 

 simply young of other species. 



GENUS EPISCHURA Forbes. 1882. 



Eelated with Heterocope Sars. The thorax is six-jointed, the last 

 two segments partly united. The abdomen is five-jointed in the male 

 and four-jointed in the female. Antennae 25-jointed, the right male 

 being geniculate. Abdomen of male with prehensile appendages, 

 often more or less distorted. Inner rami of swimming feet one jointed. 

 Fifth feet one branched, in the male modified for prehension. Caudal 

 stylets with three long sette. The first mention of an animal of this 

 genus seems to be Pickering's description of Scopiphora vagans from 

 deep water in Lake Ontario. It seems almost certain that the species 

 so imperfectly described in Dekay's Crustacea of ISTew York, is none 

 other than a species of UpiscJmra, but I hesitate to substitute for a name 

 accompanied by good descriptions and figures, and one which has 

 already been incorporated to some extent into our literature, one 

 which is founded on a description so imperfect and general that one 

 incidental character alone enables one to guess its application. The 

 following is Pickering's description: 



