NON-PARASITIC MARINE COPEPODA. 425 



Genus CLAUSIA, Boeck. 



1. Clausia elongata, Boeck. 



Clausia elongata, Boeck, Oversigt Norges Copep. (1864), 

 p. 10. 



Calanus Clausii, Brady, Nat. Hist. Trans. N. & D. (1865), 

 Vol. L, p. 33, PL I., figs. 1-11, 13. 



Often taken in abundance, by the surface net, in the open sea, 

 and in tide-pools, all along our coast. 



Boeck's C. elongata is undoubtedly the same species as that 

 described by myself (possibly a little later, though I am not 

 perfectly sure as to the actual date of publication of Boeck's 

 monograph) under the name Calanus Clausii. The differences 

 between this and the genus Paracalanus, Boeck (Calanus, Claus) 

 lie chiefly in the one-jointed inner branch of the first foot, and 

 in the very small or entirely wanting fifth foot of the female. 

 It is, I think, open to doubt whether these ought to be consi- 

 dered of generic importance, but the separation having been 

 made, it seems best to adhere to it. 



Genus DIAS, Lilljeborg. 



1. Dias longiremis, Lilljeborg. 



Abundant all round the British Islands, both in the open sea 

 and between tide marks : frequent also in brackish water. 



Genus TEMORA, Baird. 



1. Temora longicornis, (Midler.) 



Cyclops longicornis, Miiller, Entomostraca (1785), p. 115, T. 

 XIX., figs. 7-9. 



Temora finmarcliica, Baird, Brit. Entom. (1850), p. 228, T. 

 XXVIII., figs. la-g. Claus, Die frei leb. Copep., p. 

 195, T. XXXIV., figs. 1-11. Brady, Nat. Hist. Trans. 

 N. & D., Vol. I., p. 36, PL I., fig. 15; and PL II., figs. 

 1-10. 



Temora longicornis, Boeck, loc. cit., p. 15. 



