OCR Text |
Show 692 DR. G. S. BRADY ON ENTOMOSTRACA [June 19, Colour of body, legs, and head orange-chestnut or pale Cliinese-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. Length of horns 80 mm. Habitat. Portuguese East Africa (Roberts Collection). 4. On the Entomostracan Fauna of the New Zealand Lakes. B y G. S t e w a r d s o n B r a d y , M.D., LL.D., D.Sc., F.R.S., C.M.Z.S. [Received May 18, 1906.] (Plates X L Y III.-L I.* ) 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 Hydrachnse, a very few insect larvae, 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 Algae 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 number 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 tlie Plates, see p. 701. |