ENTOMOSTRACA OF MINNESOTA. 151 



sette, of which three at the lower caudal augle are enlarged and 

 divergent. Surface of shell smooth. Antennules composed of a nearly 

 cyliudrical basal part and a much longer, curved, tapering, hairy 

 flagellum. Sensory setse about eight at the posterior side of the distal 

 end of the base. Antennse 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 setse and a spine, and the apical 

 joint seven setse and a spine, while the second joint of the latter has 

 one seta and a spine, the apical four setpe. 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 Latona, 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 L. 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 HOLOPEDIDJG. 



Body inclosed in a hyaline, gelatinous envelope. Head small, de- 

 pressed. Antennules short, immovable, alike in both sexes. An- 

 tennae 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 gibbeium Zaddach. 



Plate XXXV, Fig. 11. 



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 seise at the end of the second joint of the one-branched 

 female anteunee. Shell sculptureless, its lower free margin is toothed 

 caudad. Post-abdomen short, conical, straight, aimed on either side 



