ENTOMOSTRACA OF MINNESOTA. 335 



figure of a tessellata (Trans. Linn. Soc, v. 26, PI. 23, Fig. 39), but this 

 species is longer in proportion to height and has the highest point of 

 the dorsal margin a little farther 'behind. Ventral margin very 

 slightly emargiuate. In dorsal and ventral view somewhat resembling 

 Brady's figure of Macrocypris minna (loc. cit., PI. 28, Fig. 34). Eight 

 [? left] slightly overlapping the left ['? right]; surface smooth, with 

 minute punctures and short hairs, but with a group of scattered, large 

 sordid, yellowish punctures about the middle of each valve. Color 

 bluish- white (nearly that of thin milk), though some specimens show 

 a decided pale greenish tinge. Basal joint of superior antennte with 

 two short sette above and one below; second joint with a single short 

 one below; third with two short unequal setse above and one below; 

 fourth with two above like those of the third, and two long ones below; 

 fifth as the fourth; sixth with the two upper setse as in the third and 

 fourth, but with four long ones below; seventh with two long and two 

 shorter setae. Inferior antennse with one moderately long and two 

 short claws, and two setai from the end of the last joint, and with four 

 long claws (one shorter than the other three), and one moderately long 

 seta, and one long one from the end of the penultimate joint, besides 

 four rather long ones above, and two beneath about its middle. Third 

 joint with the usual single stout seta from its end beneath, and the 

 usual fascicle of five long and one short one above near the end, and 

 the usual articulated process. Post-abdominal ramus similar to that of 

 G. incongruens as figured by Brady (loc. cit., PI. 23, Fig. 20), but longer, 

 having three unequal setae, the terminal one longest. Seminal gland 

 very similar to that of Not odromas monachns (loc. cit., PI. 37, Fig. 36). 

 Length ^ of an inch; height yV: greatest thickness y^ Probably the 

 largest known species of the genus. It is abundant in the ponds along 

 the upper Arkansas river in the Mount Harvard region, at an altitude 

 of about 8,000 feet. When first taken, my specimens were brownish 

 from adhering mud, but alcoholic specimens have the livid white color 

 above mentioned. The lucid spots are indistinct and difficult to make 

 out; there are about nine, the two anterior obliquely transverse and 

 long, the two posterior small." (Y. T. Chambers.) 



Habitat: Upper Arkansas river in Mount Harvard region. (V. T. 

 Chambers.) 



FAMILY DARWINULIDJE. 



"Antenn£e destitute of swimming setae and of poison gland and 

 duct. Mandible-palp three-jointed; the basal joint large and densely 

 setiferous. Two pairs of jaws, the first bearing a large branchial 

 plate, the second a smaller branchial plate and a pediform palp. Two 

 pairs of feet external to the valves. Post-abdominal lobes sub-conical, 

 small." (Brady and Norman.) 



