[No. 



while in nearly the same place, probably by the action of the 

 2nd pair of antennae; but at the slightest disturbation it 

 suddenly starts away so rapidly as hardly to be got sight of. 

 The latter movement is effected by a powerful stroke of the 4 

 natatory legs, combined with a sudden bend of the tail, whereby 

 the broad caudal fan acts with great force upon the water. 

 Often is the said abrupt movement repeated at short intervals, 

 and thereby the body thrown about through the water in long 

 and rapid jerks. The attitude of the body during the movements 

 is more generally an erect, the front extremity turning upwards, 

 and the anterior antennae extended to either side, the latter 

 organs acting apparently as a sort of balancing poles. As 

 usual, the males are more active than the females, especially 

 when the latter are encumbered by their large egg-bags. 



Occurrence. — The mud that yielded this species was collected 

 on the 14th March 1885 from a Lagoon near Eacecower — 4 

 miles from Rockhampton. 



Distribution. — If my identification is correct, the range of 

 the species is rather wide, extending to Ceylon, and in all pro- 

 bability also to the Indian contiuent 



2. Diaptomus Lumholtzi, n. sp. 



(PI. VIII, figs 5-12) 



Specific Characters. — Form of body much more slender 

 than in the last species, anterior division in female narrow 

 fusiform, greatest width not exceeding Vs of the length, terminal 

 lobes not very projecting, rounded, with two acute projections, 

 both pointing outwards. First caudal segment in female very 

 large, longer than the remaining part of the tail, and rather 

 dilated at the base, with a distinct lateral spine on either side; 

 2nd segment well-defined from the 2 succeeding which ^ 

 coalesced ; furcal lobes short and broad. Anterior antennae of fe^ ]e 

 very slender and elongate, reaching far beyond the caudal few 



