ENTOMOSTEACA OF MINNESOTA. 331 



Viewed from above (Fig. 10} the shell is ovoid, pointed in front 

 and rounded behind. The greatest width is caudad of the middle. 

 Hingeline straight. 



Viewed from below (Fig. 11) the contact line is straight. 



The claws on the antenna (Fig. 13) are toothed. The plumose 

 natatory setse reach to the extremity of the terminal claws. 



No dagger-shaped seta visible on either the penultimate or ante- 

 penultimate joint of the mandibular palp. 



The biarticulate claws on the first mandibular process of the first 

 maxilla toothed. 



The claw of the first foot is long, slender, finely pectinated and 

 curved. 



The abdominal ramus is short, feeble and slightly curved. The 

 terminal claw is long, slender, slightly curved, pectinated near the 

 end. The claw is about two-thirds as long as the entire ramus. 



I have never encountered any males of this species; but since Wen- 

 zel Vclvra (221) has found males of this species in Bohemia, and since 

 it is anatomically closely related to the other members of this group, I 

 include it in this genus. 



Habitat: Eare. Cincinnati, Ohio (Turner, 213). * 



Cyprinotus crena Turner. 



Plates LXVII, Figs. 11-13; LXIX, Figs. 22-31. 



1892.— Cypr is sp. {?) C. H. Turner (212), p. 71; PI. II, Figs 11-13. 

 1893.— " crcnaia C. H. Turner (213), p. 9; PI. II, Figs. 22 32. 



Length of female 1.23 mm. Height 0.63 mm. AYidth 0.60 mm. 

 Length of male 1.14 mm. Height 0,60 mm. Width 0.45 mm. 



The shell is equivalve, very thin, the free margins of one valve are 

 bordered with blunt teeth. The ventral margins of both valves bear 

 hairs. Shell reticulated with contorted lines; the reticulations are 

 most distinct on the cephalic portion of valve. Lucid spots about 

 nine, sub-central. Color, various shades of greenish yellow. The 

 caudal half of shell of male appears to be marked with concentric 

 retort shaped lines. Since the shell is very thin this appearance is 

 due to the presence of spermatozoa or spermatophores within the 

 shell. 



Viewed from the side (Fig. 22) the shell is sub-reniform, highest 

 about the middle, cephalic and caudal extremities about the same 

 width. Caudal, dorsal, and cephalic margins convex; ventral margin 

 nearly straight, slightly convex at the middle. 



Viewed from above (Fig. 23) the shell is sub oval, widest behind 

 the middle. Caudal margin rounded, cephalic margin bluntly pointed. 

 Hinjjeline sinuate. 



