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Show 6 9 4 DR. G. S. BRADY ON ENTOMOSTRACA [J u n e 1 9 , ISOPODA. Parantliuva nigrofuscata Lucas. AMPHIPODA. Paracalliope fluviatilis G. 31. Thomson. Paracorophium excavatum G. 31. Thomson. SCHIZOPODA. Tenagomysis novae-zealandiae G. 31. Thomson. MACRURA. Xiphocaris curvirostris Seller. BRACHYURA. Hymenosoma lacustris Chilton. The foregoing list of British species might have been considerably enlarged, but of many I do not possess accurate records and have therefore omitted them altogether. The disproportion, however, between the numbers of British Lake species and of species inhabiting similar places in New Zealand-so far as our present knowledge extends-does not need to be further dwelt upon. The disproportion is not, perhaps, greater than that found among vertebrate animals, both aquatic and terrestrial. To name, for example, only aquatic animals, it may be noted that while New Zealand possesses only one native Amphibian, Great Britain has eight; and that while the freshwater fishes of Great Britain are very numerous, the number of New Zealand species is extremely small. It is not, therefore, at all surprising to find that the freshwater Crustacea of New Zealand, as at present known, number only about one-third or one-fourth of the British species, and it seems scarcely likely that further research will materially alter these proportions. But it is noticeable that the great preponderance of British species is confined to the Entomostraca; while of the higher Crustacea, which are very poorly represented in Great Britain, New Zealand possesses a considerable number. The lakes explored by Messrs. Lucas and Hodgkin were Waikare, Taupo, Rotoiti, Roto Aira, Waikaremoana, Wakatipu, and Manapouri. C l a d o c e r a . S im o c e ph a lu s gib bosus G. 0. Sars. Simocephalus gibbosus Sars, On Freshwater Entomostraca from the Neighbourhood of Sydney (1896), p. 15, pi. ii. figs. 4-6. Numerous examples of this fine species were found in " nettings from among reeds at a depth of six feet,.'5 in Lakes Rotoiti and Waikare. S im o c e ph a lu s o btusatu s (Thomson). Daphnia obtusata Thomson, On New Zealand Entomostraca, Asellus aquaticus Linnt. Gammarus pulex De Geer. |
