28 



Artemia arietina, Fischer, Middendorffs Sibirische Reise, ii. 156. 

 t. 7. f. 31-35 (1851). 



Hab. In vicinitate urbis Odessae ; Middendorff. 



This species, which was found by MiddendorfF in the neighbour- 

 hood of the town of Odessa, is about from 4 to 6 lines in length. It 

 approaches very near to the Artemia salina. The inferior antennae 

 in the male have the second joint very broad and flat and sharp- 

 pointed. The superior antennae are forked at the extremity, the 

 forks unequal, each having two terminal setae. The eye is very large 

 and the caudal segment is bilobed, each lobe terminating in three 

 pretty long setae. 



5. Artemia KoppENiANA, Fischer. Antennis duabus ut in prce- 

 cedente ; segtnento caudali non lobato nee setigero. 



Long. 21-3 lin. 



Artetnia Koppeniana, Fischer, MiddendorfF' s Sibirische Reise, ii. 

 157. t. 7. f. 36-37 (1851). 



Hab. In Russia Australi ; Koppen. 



This species was found in Southern Russia by M. Koppen, and is 

 only from 2\ to 3 hues in length. Its principal difference consists 

 in the form of the caudal segment, which is not lobed at the ex- 

 tremity, but is simply squared off and has no setae springing from it. 



Genus Polyartemia, Fischer. 



Corpus molle, gracile; segmentum caudale pinnis nullis instructum ; 

 pedes branchiales, paribus novemdecim. Anteniice inferiores 

 tnaris bi- articulates, articuli terminales in ramos duos divisi et 

 dentibus numerosis instructi ; articuli basales appendicibus 

 tenuibus armati. 



Polyartemia, Fischer, Middendorffs Sibirische Reise, ii. 154 

 (1851). 



This genus was founded by Sebastian Fischer to receive a species of 

 the family BranchipodidcB, which differs in some respects from any 

 of the genera of the family. It is furnished with appendages to the 

 male inferior antennae, which are two-jointed, approaching in this 

 respect to the genus Chirocephalus — and it is destitute of caudal fins, 

 resembling in this structure the genus Artemia — but the number of 

 feet is nineteen pairs, and the male inferior antennae have each of the 

 terminal joints divided into two broad, flat branches, the one over- 

 lying the other like the branches of a pair of scissors. These branches 

 are furnished on their edges with three or four rows of sharp teeth. 

 The basal joint has a rounded process at about half its length armed 

 with short setae. The appendages attached to these organs are coni- 

 cal in form, thin, and apparently not provided with digitiform or fla- 

 belliform appendages. The abdominal portion of the body is shorter 

 in proportion than in any of the other genera, and the ovarian sac of 

 the female is moderately large and lies close upon the abdomen, 

 seeming when viewed from above to be amalgamated with it. The 

 male organ is cylindrical, four-jointed, and is contained in a sheath 

 which is serrated on one side. 



