of the North-east Coast of England. 3- 



be considered of generic importance ; but the separation having 

 been made, it seems best to adhere to it. 



Genus DiAS, Lilljeborg. 



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 (Muller). 



Cyclops longicornis, Miiller, Entomostraca (1785), p. 115, t. 19. figs. 7-9. 

 Temora jimnarchica, Baird, Brit. Entom. (1850), p. 228, t. 28. figs. \,a-q\ 



Claus, Die frei-leb. Copep. p. 195, t. 34. figs. 1-11 ; Brady, Nat. Hist. 



Trans. N. & D. vol. i. p. 36, pi. 1. fig. 15, and pi. 2. figs. 1-10. 

 Temora lotir/icornis, Boeck, loc. cit. p. 15. 

 Diaptomus loiifficaudatus, Lubbock. 



(Not Monoeulus Jinmarchicus, Gunner.) 



Common in the open sea ; and between tide-marks perhaps 

 the most abundant of all British species. 



2. Temora velox, Lilljeborg. 



In the autumn months, when the brackish pools of salt 

 marshes have become thoroughly warmed by the sun, this 

 species occurs in such situations in immense profusion. I 

 have only on one or two occasions met with a stray specimen 

 amongst the weeds on the sea-shore. 



Genus Isias, Boeck. 



Isias clavipes, Boeck. 

 Isias clavipes, Boeck, loc. cit. p. 18. 



Superior antennee twenty-five-jointed, about equal in length 

 to the cephalothorax ; joints short and broad at the base, and 

 gradually increasing in length to the nineteenth, which is 

 about four times as long as broad ; first fifteen joints of the 

 male antennee bearing each a single club-shaped, ciliated, 

 auditory seta ; hinge-joint of the twenty-one-jointed right male 

 antenna situated between the eighteenth and nineteenth joints ; 

 eighteenth joint formed by the coalescence of the normal 

 eighteenth and nineteenth ; nineteenth by the twentieth and 

 twenty-first; twentieth by the twenty-second, twenty-third, 

 and twenty-fourth. Mouth-organs and swimming-feet as in 

 Gentrojyages typicus. Fifth pair of feet two-branched, in the 

 female having the inner branch of one joint with two terminal 

 setag, the outer branch of three broad laminar joints, the second 

 of which is produced on the inner margin into a broad spinous 



1* 



