438 D. J. SCOURFIELD, SYNOPSIS OF THE KNOWN SPECIES OF 



usual Moina type with about nine teeth, the first or bifid tooth 

 being scarcely longer than the pointed setose teeth ; terminal 

 claws without special "combs," but with strongly marked lateral 

 setae. Length about ~ inch. (See Figs. 5, 6, 7, and 8.) 



Dad ay's Latin description in his " Crustacea Clad. Faunae 

 Hungaricae" (Budapest, 1888) is short, but seems certainly to 

 refer to our species. His two figures (Tab. III., 1 and 2) are 

 apparently rather diagrammatic. 



I found this species as long ago as 1893 in a little roadside 

 pond on Lord Tenn3^son's estate at Farringford, Isle of Wight, 

 but it has not hitherto been referred to in any publication. 



BoSMIXIDAE. 



Bosmina Baird, 

 B. longirostris (0. F. Miiller). 



This is a common species in the south and east of England — 

 where, in fact, it is the only species of the genus to be found. 

 In the north of England, North Wales, Scotland, and Ireland it 

 does not seem to be so common, its place being probably taken by 

 B. ohtusirostris. The variety cornuta occurs frequently, some- 

 times alone and sometimes associated with the typical form. 

 Some of the other varieties mentioned by Lilljeborg certainly 

 occur, but I have no separate records of them. 



B. obtusirostris Sars. 



B. longispina Norman & Brady (17) (in part), Scourfield (28), 

 Scott (20), Creighton (6, 7), and several other authors. 

 It is somewhat doubtful whether this ought to be sepaiated 

 from B. longis'pina, but it will probably be as well to follow 

 Lilljeborg in regarding it as distinct from the extremely long-spined 

 form. In one or other of its numerous varieties it occurs over a 

 large part of the British Isles, but has never been seen in the 

 south and east of England, and only doubtfully in the Midlands. 



B. longicornis Schoedler. 



Mr. W. F. de V. Kane informs me that he has taken this 

 species in the Boyne Canal, and I have seen specimens from 

 Lough Melvin which approached this very closely. 



B. longispina Leydig. 



B. longisinna Norman k Brady (17) (in part), and many 

 other authors. 



