On Fresh-water Crustacea. By Robert Gurneij. 285 



of the abdomen and closely ciliated. Egg-sac not fully developed, 

 shorter than the 3rd abdominal segment, and probably cylin- 

 drical when fully formed. Second antenna narrow, flattened, 

 with the external margin prolonged to a point (plate IX. fig. 8). 

 Branchial legs, having the 6th endite somewhat triangular in 

 shape, with a rather pointed apex. Coxal exite single, with a 

 single large notch on its external margin. Base of the setre of the 

 exopodite and 6th endite surrounded by a ring of minute denticles. 



Male : Head and thorax slightly longer than the abdomen. 

 Segments of the latter scarcely longer than broad, the 3rd and 8th 

 having each a pair of small ventral knobs. Furca mutilated, but 

 apparently similar to that of the female. Second antenna not 

 fully developed, but consisting of a stout basal part and a slender 

 distal joint not longer than the basal joint. No frontal appen- 

 dages. Legs as in the female. 



Measurements : — 



It is much to be regretted that adult specimens of this species 

 were not obtained, as the habitat was such that only Artemio 

 might have been expected to be found, the density of the water 

 reaching as high as 1 * 035. It is quite clear that the specimens do 

 not belong to that genus, but I refer them to Bmnchinecta with 

 some doubt. It is possible that they may be immature specimens 

 of B ranch inecta spinosa M. Edw., which has been found in salt 

 water near Odessa. 



Branckipus pisciformis Schaeff. — Nearly all the irrigation pools 

 in Biskra contained B. pisciformis in abundance, but it was not 

 met with anywhere except in Biskra,, where it was also found by 

 M. Blanchard. M. Simon has recorded its occurrence in Tunisia 

 (1885). 



Chirocephalus cliaphanus Prevost. — This species was found at 

 Oued Tindja, Sidi Athman, and Rades, in Tunisia. All the 

 individuals belonged to the large race. M. Simon records its 

 occurrence in three places in Algeria, In two of these places the 

 large race was found, and in one (Kef-el-Akdar) the small race. 



StreptoeepJialus bimaris * sp. n. — Female : Body compact and 

 thickset, the head and thorax together exceeding the length of the 

 abdomen without the rami, but about equal to it if the rami are 

 included. Egg-sac large, rather longer than the first five seg- 

 ments of the abdomen, and ending in a short, finger-like process 

 (plate VIII, fig. 5). First pair of antenna? simple, linear appen- 

 dages ; 2nd pair thick and fleshy, somewhat triangular in shape, 



* " Between two seas," i.e. between Lake Bizerta and Garaa Achkel. 



