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 setaB 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 - 2 \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 G. 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 Claus. 



(c. Anterior antennce 12-jointed.) 



7. Cyclops sehkulatus, Fischer. PL XXII, figs. 1—14. 



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

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

 26—31 (1851). 

 — — Lilljeborg. De Crust, er ord. trib., p. 158, 



t. xv, fig. 12 (1853). 



H 



