692 DR. G. S. BRADY ON ENTOMOSTRACA [June 19,. 



Colour of body, legs, and head orange- chestnut or pale 

 Chinese-orange. Occiput, outside of ears, and a large patch above 

 the nostrils, ash or mouse-grey. Chest and inner side of fore legs 

 above knee more whitish. Crest between horns and on forehead 

 dark rufous and very long and thick. Horns long, basal third 

 ringed and rugose ; much slenderer than in the four allied forms. 



Leng-th of horns 80 mm. 



Habitat. Portuguese East Africa (Roberts Collection). 



4. On the Entomostracan Fauna of the New Zealand Lakes. 

 By G. Stewardson Beady, M.D., LL.D., D.Sc, F.R.S., 



C.M.Z.S. 



[Received May 18, 1906.] 

 (Plates XLVIII.-LI.*) 



I am indebted to my friends Messrs. Keith Lucas, M.A., and 

 G. Hodgkin, M.A., for the opportunity of examining the very 

 interesting Plankton collections made by them during their 

 bathymetrical survey of the New Zealand Lakes. The present 

 paper deals with the Entomostraca only. 



The higher Crustacea — comparatively few in number — are 

 reported upon by Professor C. Chilton of Canterbury College, 

 Christchurch, in a separate paper (infra, p. 702). Besides the 

 Crustacea, which constituted almost the whole bulk of the nettings, 

 there were a few Hydi-achnse, a very few insect larvse, and in some 

 of the gatherings a considerable number of a rotifer belonging 

 to, or closely resembling, the genus Asplanchna. Fragments of 

 confervoid and unicellular Algge were also abundant, and some 

 very small fragments of a polyzoan were also noticed. Samples 

 of about seventy nettings came under my review. These were 

 taken from seven different lakes in depths varying from the 

 shallow- water of the shore to an extreme depth of about 1450 feet. 

 The proceeds were preserved in various solutions — picronitric, 

 formalin, and alcoholic. The picronitric solution is objectionable, 

 acting as a solvent on the calcic material of the shells, and 

 formalin is liable in a less degree to the same objection. But, 

 as a rule, the specimens were well preserved. 



The most striking fact arising out of this research is the small 

 niimber of species found in so extensive a series of nettings from 

 so many different lakes. The climatic and physical conditions of 

 these lakes may be taken as closely approximating to those of the 

 English Lake-district of Cumberland and Westmoreland ; and it 

 is interesting to compare the results of the investigation of the 

 two areas so far as is at present possible. The following table 

 embraces those species which occur only in the lakes themselves,. 



* For explanation of the Plates, see p. 701. 



