250 TENTH AlfNUAL REPORT 



PLEUROXIS PROCURVUS, Bil'ge. 



(Plate X, fig. 6 ) 



Very characteristic. Found in Shady Oak lake, and elsewhere 

 abundant. 



PLEUROXIS UNiDENS, Birge. 



A species which agrees best with this is quite abundant. It is, how- 

 ever, always of a deep brownish color, and the beak is long and curved 

 inward; it nia}^ be distinct. 



A third form of Fleuroxis, probably P. denticidatus, Birge, is abund- 

 ant also. 



GRAPTOLEBRIS INERMIS, Birge. 



(Plate X, figs. 8, 11-12.) 



Resembles Alona festiKJinarla very closely; the antenna? are peculiar; 

 each joint has a median circlet of fine bristles; the upper ramus is ter- 

 minated by two long setae, one shorter seta and a stout spine; the joint 

 preceding the terminal one has a stout seta. The description given 

 by Birge is otherwise complete. Lake Minnetonka. 



CREPIDOCERCUS SETIGER, Bil'ge. 



This is exceedingly rare, and by reason of its small size, difficult to 

 distinguish. It has been encountered but once in Minnesota. This ' 

 species is easily recognized when found, and though our specimens 

 differ a little from the figure given by Birge, they are doubtless the 

 same. 



ALONA OBLONG A, P E. Muller. 



The specimens examined differ somewhat from Miiller's description. 

 The caudal claw is pectinate; the spine at its base is large and covered ^] 

 with a tuft of hairs; the teeth of post-abdomen are large, emarginate ' 

 and hairy; otherwise the agreement is very close; length .07 cm^ , ; 

 Found in Grass Lake, Richfield. 



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