Freshwater JEntomostraca of South America. 233 



Candona albida, Dana. 

 Lynccus nastdus, Gay. 



albicans, Gay. 



armatus, Gay. 

 Diaptomus Drasillensis, mihi. 

 Cyclops brevicornis, Gay. 

 Daphnia spinifera. Gay. 



granaria, Gay. 

 Brasiliensis, milii. 



Fourteen species, all belonging to genera also found in Europe, 

 and afl'ording several remarkable instances of representative spe- 

 cies. Daphnia spinifera closely resembles D, miicronata. Diap- 

 tomus Brasiliensis in many points agrees perfectly with D. Castor, 

 Candona albida, and all the Cyprides, are very like the English 

 species, and if the Lyncei were described more in detail the 

 same would probably be found to be the case with them also. 



Mr. King has lately described some of the Australian fresh water 

 Etitomostraca in the Pro. Roy. Soc. Van Diemen's Land, January, 

 1853. He mentions four species of yilona, two of Euryccrcus, 

 two of Chydorus, two of Dunhcvcdra, n. g., one Macrothrix, two 

 Moincc, and four Daphnia:, one of which he considers identical 

 with D. nmcronata, Miiller. These again are all European genera 

 except one, Dunhevedra, which however docs not differ materially 

 from European forms. 



This result is interesting, and 1 believe in accordance with what 

 has been observed in other families. It is curious that fresh water 

 genera have usually more extended geographical limits than those 

 which inhabit either the land or the sea. 



Genus Cypris. 



Sp. 1. Cypris Donncllii, Baird, Proc. Zool. Society. 



" Carapace valves elongate oval. Anterior extrenu'ty narrower 

 than posterior, and considerably flatter ; posterior extremity 

 rounded, and very convex; dorsal edge arched; ventral slightly 

 reniform. The surface of the valves is smooth and shining, of a 

 brown colour, variegated with patches of a darker shade. The 

 pediform antennae are provided with about six bristles of consi- 

 derable length." 



Fresh water ponds, Co({uind)o. 



