640 PATAGONIAN EXPEDITIONS : ZOOLOGY. 



Remarks. — As v. Daday states, only young individuals possess the 

 peculiar sculpture of the shell by longitudinal ridges represented in the 

 figures I and 2 on v. Daday's plate 15. 



Suborder Cladocera. 



Family DAPHNIDjE Dana. 



DAPHNIA O. F. Mueller. 



Daphnia hastata Sars. 



1896 D. ptilex var. hastata Richard in: Ann. Sci. nat. Zool. ser. 8, v. 2, 



p. 246, pi. 24, f. 16, pi. 25, f. 12, 18. 

 1902 D. hastata v. Daday in : Term. Fiiz., v. 25, p. 279, pi. 11, f. 11, 12. 

 Localities. — Stat. 4 Pool drying up, 10 miles above Sierra Ventana. 



40-50 specimens, all 9. 

 Stat. 26 a few 9. 



Distribution. — D. pttlex var. hastata is found, according to Richard, in 

 Europe (Austria, Russia, Norway). The Patagonian form has been re- 

 corded by V. Daday from Misionaros on the lower Santa Cruz River 

 (49° 59 S., 68" 33 W.). 



ReniarJis. — Our specimens correspond to the Patagonian form de- 

 scribed under this name by v. Daday. As v. Daday himself admits, this 

 is not exactly the same form as that described by Richard as D. pulex var. 

 Jiastata. 



Suborder Phyllopoda. 



Family APODIDyE Burmeister. 



LEPIDURUS Leach. 



Lepidurus hatcheri sp. nov. 



(Plate XLVIII, Figs. \a and ib.) 



Locality. — First water hole north of basalt ridge, 50 miles from Rio 

 Chico. 1,950 feet. 26 Febr., 1899. — 2 9. (Foothills of Cordilleras, 

 about 47-48° S.) 



Description. — Scutum large, suboval, emarginate behind, covering about 

 two thirds of the body. Of the abdomen, 9 or 10 segments (including 

 telson) are uncovered. Eyes elliptic, closely approaching one another in 



