ENTOMOSTRACA OF MINNESOTA. 51 



*Euryteniora afflnis Poppe. 



Plates I, Figs. 5-10; LX, Figs. 8-15, 



Lilljeborg '53 (Temora velox); Poppe '80 (Temora affinis); Claus '81 (Temora affiais); 

 Giesbrecht '81^ (Eurytemora hirundo). 



Form rather robust, about 1.60 mm. long, variously ornamented 

 with colord markings; head separated by an obvious suture from the 

 thorax, rounded anteriorly, with small forked beak; antennae about as 

 long as the thorax, 24:iointed, the twelve basal joints being quite short 

 and uniform, in the right male antenna geniculated and thickened be- 

 yond the twelfth, the geniculation beiug between the eighteenth and 

 nineteenth, the seventeenth and eighteenth segments furnished with 

 comb like or file-like plate against which plays a similar shorter plate 

 on the nineteenth; the antennules short, three-jointed ramus with 

 twelve seta?, two-jointed ramus with about fifteen; jaw with eight 

 acuminate teeth and a small spine; mandiblar palp with a two-jointed 

 and four jointed ramus, the former with seven terminal and four lat- 

 eral setic; maxilliped very small, six-jointed; first pair of feet with the 

 inner ramus one- the other three-jointed, remaining swimming feet, 

 two- and three-jointed; fifth foot in the female with three joints (appar- 

 ently four), the basal bearing a single external spine, the second, two 

 external spines and a strong internal process, the terminal joint a long 

 pectinate seta and a small spine; the fifth feet of the male both four- 

 jointed, the right terminating in a long, irregularly excised claw and 

 the left in a fan-shaped expansion with a central spine. The abdomen 

 is five jointed in the male and terminates in two long slender stylets, 

 but sparsely beset with bristles along the inner margin, while in the 

 female the abdomen is three jointed and the shorter stylets are densely 

 spinous and bear numerous fine sette medianly. The second segment 

 of the abdomen in the female is produced into a spiniferous process 

 with small spines on its sides. The caudal stylets are about six times 

 as long as wide in the female and nearly eight times in the male, the 

 preceding segment being densely covered with short spines in the 

 former, while in the latter there is on either side a cluster of longer 

 stylets. The eggs are carried in a large spherical mass beneath the 

 abdomen as in OsphranUcum (Potamoichetor). The one-jointed ramus 

 of the first foot bears seven setse, tlie terminal joint of the other ramus, 

 five setfe and three spines; the second segment of the inner ramus of 

 second and third feet bears six sette, its predecessor three, while the 

 terminal segment of the outer ramus carries five sette, one long, ser- 

 rated, apical spine and a short external spine; the fourth foot has bub 

 five set* on the apical segment of inner ramus and five set*, a ser- 

 arted spine and two small spines upon the opposite branch. 



4 



