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CRUSTACEA. 



PART VII.-MYSIDACEA. 

 BY W. M. TATTERSALL, D.Sc, 



{Professor of Zoology, University College, Cardiff). 

 WITH FOUR PLATES. 



PAGE 



273 

 277 

 277 

 279 

 301 

 303 



I. — Introduction ....... 



II. — List of Species ....... 



III. — List of Stations at which Specimens were obtained 

 IV. — Descriptions of Species ..... 



V. — List of Papers referred to . 

 VI.— Index . . . . . 



I. -INTRODUCTION. 



The collection of Mysidacea obtained by the " Terra Nova " includes twenty species, 

 of which six were captured in Antarctic waters, twelve off New Zealand, and three 

 (including one also caught in New Zealand waters) in the Atlantic. 



It was perhaps hardly to be expected that the collections would contain much 

 in the way of novelties from the Antarctic seas. At least nine expeditions have explored 

 these waters in the last twenty years, and our knowledge of the fauna, though not by 

 any means complete, is considerable. Additions to the list of known forms are to 

 be looked for among smaller material collected by special means rather than from 

 collections made by dredging and trawling in the ordinary way. Only one new species, 

 Mysidetes brachylepis, was collected by the " Terra Nova " in the Antarctic Ocean, and 

 only six species were obtained there altogether. 



It may not be without interest to summarise the results of recent Antarctic 

 exploration, with reference to the Mysidacea, in tabular form. Regan (1914), as a 

 result of his examination of collections of Antarctic fishes, has divided the waters of 

 the south polar regions into two zoo-geographical areas : — (1) Antarctic zone — 

 including the Antarctic continent and islands to the south of the isotherm of 6° C. — 

 with two districts. Glacial and Kerguelen ; and (2) Sub-antarctic zone — including 



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