ee 
ENTOMOSTRACA 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 sets 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 Vavra (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: Rare. Cincinnati, Ohio (Turner, 213). 
Cyprinotus crena Turner. 
PLATES LXVII, Fiaes. 11-13; LXIX, Fias. 22-31. 
1892.—Cypris sp. (?) C. H. Turner (212), p. 71; Pl. II, Figs 11-13. 
1893.— ‘ crenata C. H. Turner (213), p. 9; Pl. II, Figs. 22-32. 
Length of female 1.23 mm. Height 0.63 mm. Width 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. 
Hingeline sinuate. 
