NON-PARASITIC MARINE COPEPODA. 429 



2. Cyclops ^equoreus, Fischer. 



C. eequoreus, Fischer, Abhandl. der Akad. der Wissenschaft, 

 Miinchen (1860), Band VIII., p. 654. Brady, Nat. Hist. 

 Trans. N. and D., Vol. IV., p. 128, PI. IV., figs. 9-16. 



In brackish pools at Seaton Sluice, Northumberland. 



3. Cyclops littoralis, nov. sp. Plate XVII., figs. 9-14. 



Superior antennae twenty-two-jointed, clothed with long setae, 

 more particularly towards the base, joints all very short, the 

 two terminal ones, which are the longest, not being much lon- 

 ger than broad, the twelfth and sixteenth much produced, and 

 bearing a long seta at the external margin. Inferior antennae 

 without a secondary branch, four-jointed. Fifth pair of feet 

 composed of a single three-jointed branch. Caudal segments 

 about four times as long as broad ; setae four, the two central 

 ones being alike in length and equal to the three preceding 

 segments. 



Hah. — Amongst weeds in tidal pools, near Whitley and By- 

 hope : scarce. 



4. Cyclops ovalis, nov. sp. Plate XVIII., figs. 1, 2. 



Superior antennae twenty-four jointed, as long as cephalo- 

 thorax, slender and nearly equal in width throughout, joints 

 about equal in length and breadth at the base, gradually increas- 

 ing in length towards the apex, the terminal joint being about 

 thrice as long as broad ; each joint bearing a single short, deli- 

 cate hair on the external margin, the twenty-second and twenty- 

 third one on each margin, the last having four or five apical 

 setae. Caudal segments about four times as long as broad, setae 

 not much longer than the caudal segments. 



Hah.— One specimen only taken off Sunderland in the surface 

 net. 



Genus OITHONA, Baird. 



1. OlTHONA HELGOLANDICA, CldUS. 



Oithona helgolandica, Claus (1863), Die frei lebenden Cope- 

 poden, p. 105, Taf. XI., figs. 10-12. 



