CYCLOPS. 109 



second long, slender, and bisetose. The male has also 

 a foliated club-shaped 4-setose appendage (fig. 8 a) on 

 the first abdominal segment. Caudal segments (fig. 8) 

 long and narrow, at least six times as long as broad ; 

 the two median tail setse much longer than the rest, 

 the innermost of the two being the longest and about 

 twice the length of the f urea ; a short spine-like seta 

 on the outer margin of the caudal segment below the 

 middle. Length -^th of an inch (-9 mm.). 



The only places in which I have found this species 

 are at Hartlepool, where it occurred in brackish pools 

 near the border of the slake, and at Pwllheli, in a bend 

 of the river, not very far from the sea. 



I at first thought it distinct from C. insignis or any 

 other known species, and described it under the 

 specific name Lubbockii, but I now believe my speci- 

 mens to be identical with C. insignis, though differing 

 slightly in some respects especially as regards the 

 setose furniture of the antennas from the typical 

 form described by Glaus. 



(c. Anterior antennae \2-jointed.) 



7. CYCLOPS SEURULATTJS, Fischer. PI. XXII, figs. 1 14. 



Cyclops serrulatus, Fischer. Bulletin de la Soc. Imp. des Nat. de 

 Moscou, torn, xxiv, p. 423, tab. x, figs. 22, 23, 

 2631 (1851). 



Lilljeborg. De Crust, ex ord. trib., p. 158, 

 t. xv, fig. 12 (1853). 



H 



