1915] 
Juday and Muttkowski: Alaskan Entomostraca 
29 
terminal spines borne by these two joints are alike, but the other two 
spines are different. The two outer spines of the left joint are armed with 
teeth as in the third and fourth feet, while those on the right joint are 
unarmed. The second spine of the right joint is somewhat larger than 
that on the left and is rather sharply curved in the middle and then re- 
flexed at the end. There is a minute unarmed spine on both joints at the 
base of the long terminal spine. 
Male; B, Third Right Foot, and C, Fourth Right Foot of Male. 
The terminal joint of the left leg of the fifth pair is about as long as 
the two preceding joints (fig. 4 , A). The antepenultimate joint of the right 
leg is about as broad as long and bears a slight protuberance on its inner 
margin. This joint is subject to some variation, as indicated in figure 
4, A1-A4. 
Length: 9 4.00 mm., 3.85 mm. 
Described from a large number of specimens from Upper Ice 
House Lake, St. Paul Island. Both sexes are very abundant in 
the material. 
A comparison of this form with specimens of Heterocope borealis 
