39. Alteutha depressa, Baird. 



(PI. XXX VIII). 

 Alteutha depressa, Baird, Brit. Entomostraca, p. 216, PI. XXX, figs. 1, 2. 



Syn: Carillus oblongus, Goodsir. 



Peltidium purpureum, White (not Philippi). 



Alteutha purpurodncta, Norman. 



Peltidium depressum, Brady. 



Eupelte purpurodncta, Canu. 



Specific Characters. Female. Body much depressed, seen dorsally. oblong 

 oval in form, with the greatest width about the middle. Cephalic segment very 

 large, considerably exceeding in length the 4 succeeding segments combined, 

 postero-lateral corners acutangular, rostrum large and prominent, truncated at 

 the tip. Epimeral plates of the first 3 free segments of metasome acutely pro- 

 duced behind, especially those of 3rd segment. Last segment with the epimeral 

 plates evenly rounded and far less prominent. Urosome short and broad, of a 

 structure similar to that in the preceding species. Caudal rami of exactly the same 

 appearance as in that species, apical setse, however, shorter, and none of them 

 conspicuously thickened at the base. Eye placed rather far back. Anterior 

 antennae comparatively shorter and stouter than in A. interrupta, and distinctly 

 9-articulate. Posterior antennae, mandibles, maxillae and anterior maxillipeds of 

 a structure very similar to that in the preceding species. Posterior maxillipeds, 

 however, somewhat different, the basal part being distinctly biarticulate, and the 

 hand shorter and broader, oval fusiform in shape. First pair of legs comparatively 

 more robust, with the inner ramus almost as long as the outer, and without the 

 seta inside the .middle joint. Natatory legs resembling those in A. interrupta. 

 except that in the inner ramus of 4th pair some of the setae are spiniform. Last 

 pair of legs very large and robust, falciform, proximal joint rather large, distal 

 one conically tapered, and armed at the tip with 3 very coarse spines. 



Body of a yellowish olive colour, with a dark purplish blue transverse 

 band across the middle, occupying the whole of the first 3 free segments of 

 metasome. 



Length of adult female 1.30 mm. 



Remarks. Allthough the figures and description of this form given by 

 Baird are rather poor, I must agree with Prof. Brady in thinking that they in 

 all probability refer to the present species. It is also, as opined by the same 

 author, very likely that the Carillus oblongus of Goodsir is the same species. Mr. 

 Norman, who considered the species as new, described it under the name of 

 Alteutha purpurodncta, a name which has been accepted by several other authors. 



