650 PATAGONIAN EXPEDITIONS I ZOOLOGY. 



CASSIDINA Milne-Edwards. 

 CASSIDINA EMARGINATA Milne-Edwards. 



1887 C. e. Pfeffer in: Jahrb. Hamburg. Wiss. Anstalt., v. 4, p. 103, pi. 2, 



f. 9, 10, pi. 5, f. 23-30, pi. 6, f. i-io. 



1891 C. e. Dollfus in : Miss. Cap Horn, v. 6, p. 67, pi. 8, f. 10. 

 1901 C. e. Stebbing in : Proc. Zool. Soc., p. 562. 



Localities. --Punta Arenas, i $\ Mouth of Santa Cruz River, 12 sp. 

 (c? and 9) ; San Julian, 7 sp. (<? and 9)- 



Distribution. Falkland Islands ; Tierra del Fuego ; Straits of Magel- 

 lan ; Channels of western Patagonia ; South Georgia ; Kerguelen Islands. 

 0-120 m. 



Family SEROLIDsE Dana. 



SEROLIS Leach. 

 SEROLIS PARADOXA (Fabricius). 



1884 5. /. Beddard in : Rep. Voy. Challenger, v. 1 1, p. 33, pi. 5, f. 12-14. 

 1891 S.p. Dollfus in : Miss. Cap Horn, v. 8, p. 61, pi. Sa, f. 4 (nee f. 5). 



Locality. - - Punta Arenas, 34 sp. 



Distribution. Falkland Islands ; Tierra del Fuego ; Straits of Magel- 

 lan. Shallow water. 



Remarks. - - On Dollfus' plate Sa, the figures 4 and 5 are transposed, 

 fig. 4 representing this species, while fig. 5 is S. schythei Ltk. (In the 

 explanation of the plate, p. 76, the opposite is stated.) 



Order AMPHIPODA. 

 Family ORCHESTIIDsE Dana. 



HYALELLA S. J. Smith. 

 HYALELLA PATAGONICA spec. nov. 



(Plate XLVIII, Figs. 3, a-h.) 



Localities. This species seems to be very abundant in southern Pata- 

 gonia. Hatcher has collected it at about 30-35 localities in the region 

 of the Rio Chico (47-50 S.), from near the coast to the Cordilleras 

 (highest altitudes : 1,750 and 2,000 feet). It is found in springs, small 

 streams and pools of fresh water, sometimes slightly alkaline (Arroyo Gio). 



