ENTOMOSTRACA OF MINNESOTA. 151 
sete, of which three at the lower caudal angle are enlarged and 
divergent. Surface of shell smooth. Antennules composed of a nearly 
cylindrical basal part and a much longer, curved, tapering, hairy 
flagellum. Sensory sete about eight at the posterior side of the distal 
end of the base. Antenne with massive basal portion bearing a 
dorsal bi-articulate and a ventral tri-articulate ramus. The basal 
joint of the former has four to five sete and a spine, and the apical 
joint seven setz and a spine, while the second joint of the latter has 
one seta and a spine, the apical four sete. The post-abdomen is 
short, fleshy, obtusely conical, and armed with nine supra-anal denti- 
cles. The terminal claws are strongly curved and have two secondary 
teeth. The antennules of the male resemble those of Daphnella, and 
form near their bases is a ciliated appendage. The copulatory organs 
resemble those of Zatona, and the first leg has a strong hook. This 
species was found by Birge in a small lake in Wisconsin. 
The remaining species of the genus Z. australis Sars is exceedingly 
close, but the fornices are said to be absent and the antennules are 
shorter than the anterior margin of the head. We have encountered 
this interesting species at Albuquerque, New Mexico, and are inclined 
to believe it southern in range, only sporadic in the north. 
FAMILY HOLOPEDIDE. 
Body inclosed in a hyaline, gelatinous envelope. Head small, de- 
pressed. Antennules short, immovable, alike in both sexes. An- 
tenn uni-ramose in the female, in the male a small rudiment of a 
second ramus present. Mouth parts not covered by the shell. There 
are six pairs of lammellate swimming feet. No external copulatory 
organ. 
GENUS HOLOPEDIUM Zaddach. 
The characters are those of the family. 
* Holopedium gibberum Zaddach. 
Les DOO." dae al 
Zaddach ’56; Sars ’62 and ’65; Mueller ’68; Fric ’72; Hellich ’77; Forbes ’82; 
Herrick 84; Birge ’92. 
The small head is depressed and conical, beakless. Eye small, 
with few lenses. Pigment fleck large, at the base of the antennules, 
which are short, cylindrical, slightly expanded in the middle. There 
are three apical sete at the end of the second joint of the one-branched 
female antenne. Shell sculptureless, its lower free margin is toothed 
caudad. Post-abdomen short, conical, straight, armed on either side 
