ENTOMOSTRACA OF MINNESOTA. 173 



smaller forms have but few eggs (two). The young have a thorn on 

 the augie of the fornices. Plate XLV, fig. 1, represents the ephippial 

 female of this species. There seems no reason to doubt that this is 

 only a variety of G. scitula. The small form of (7. reticulata mentioned 

 by Kurz might be referred here, while the larger form with less promi- 

 nent fornices is not so different from the American G. dcntata. 



Ceriodaplinia nitida Schoedler. 

 Ceriodaphnia qiiadrangula — Leydig. 



This species seems to be characterized by the quadrangular form 

 of the meshes of the shell-markings and the presence of teeth upon 

 the claws. Probably invalid. 



Geriodaphnia asperata and G. minuta of Moniez have remained un- 

 known to me. Of. Note sur des Ostracodes, Cladoceres, et Hy- 

 drachnides observes en Xormandie. Bid. cf etudes sclentifiques de Paris, 

 1887. 



Geriodaphnia textiUs Dana is not sufficiently fully figured to allow 

 of a suggestion as to its affinities. 



Daphnia rottmdala Say is very probably a member of this genus, 

 though the description is hardly intelligible. "Body rounded behind; 

 upper antennae three-branched, a small spine above at the joints; 

 lower five-banched; color white. Length 0.5mm." It is probable that 

 we should read "upper branch of anbennee with three setaj,'' etc., in 

 which case we may identify the above with Ghydorus or the like. 



Ceriodapliaia setosa Matile. 

 Matile '90. 



Body spherical, resembling G. rotunda and G. laticaudata, brownish 

 red. Head small, depressed. Front uniformly rounded. A deep 

 depression between head and body. Fornix moderate, spiny. Head 

 and body ornamented with polygonal meshes from every angle of 

 which springs a spine perpendicular to the surface. Antennae very 

 short. Autennules rather long, lateral seta nearer the base than the 

 tip. Post abdomen large, gradually narrowed toward the end. Anal 

 teeth seven or eight and nearly equal. Claw armed with a series of 

 fine cilia. Eye large. Macula small. Length 0.42 to 0.57 mm.; 

 heighth 0.27 to 0.36 mm. 



It is probable that this is identical with Geriodaphnia echinata 

 Moniez ('87, p. 512), but there are minor differences and the problem 

 must be left open. 



