92 ■ A EEVISION OF THE BEITISH SPECIES OP 



1878. Cyclops cequoreus, Brady (32), p. 119, pi. XIX., 



figs. 8-1 ; pi. XXT. , figs. 10-17. 



Cyclops cBquoreus occurs not uncommonly in the brackish pools 

 of salt-marshes in many parts of the British Islands. The only 

 localities which I have to add to those already recorded, are 

 Lymington, Hants {G.S.B.) ; Poole, Dorset {Rev. Dr. Norman) ; 

 Loch Stennis, Orkney {Mr. T. Scott). 



[ Cyclops Selleri, Brady. 



In the many collections which I have examined during the 

 preparation of this memoir, I have found no specimens which I 

 could certainly refer to C. Helleri, while those upon which the 

 species was originally founded have been lost by evaporation of 

 the spirit in which they were preserved. It is perhaps more 

 than probable that the types represented one of the stages of 

 development of a seventeen-]" ointed species, and under this im- 

 pression it seems best for the present to regard the species as 

 one of doubtful validity.] 



Family CALANID^. 

 Genus DIAPTOMUS, Westwood. 

 {Cyclopsine, Fischer.) 



1. Diaptomus Castor (Jurine), (PL XL, figs. 1-6). 



1785. Cyclops cceruleus, Miiller (1), p. 102, pi. XV., figs. 1-9. 

 ,, lacinulatus ( $ ), idem, ibidem, p. 105, pi. XVI., 



figs. 4-6. 

 ,, rubens {$), idem, ibidem, p. 104, pi. XVI., 



figs. 1-3. 

 1820. Monoculus Castor, Jurine (3), p. 50, pi. IV.-VI. 

 1850. Diaptomus Castor, Baird (7), p. 219, pi. XXVL, 



figs. 1, 2, 2a-j. 

 1863. „ „ Lilljeborg(9),pLXIL, figs. 1-10; 



pi. XIV., figs. 1-4. 

 1863. „ ,, Lubbock (19), p. 205, pi. 31, 



figs. 7-11. 

 1872. „ ,, Fric (24), p. 225, figs. 22a, b. 



1878. ,, ,, Brady, in part (32), p. 59, pi. VI., 



figs. 6, 8, 11. 

 1889. ,, ,, De Guerne andEichard (62), p. 11, 



fig. 1, and pi. II., fig. 1. 



This, the first described, and for long the only known species 



