118 BRITISH COPEPODA. 



(F. Anterior antennae 8-jointed.) 

 13. CYCLOPS ORASSIOORNIS, Miiller. PL XXIII, figs. 1 6. 



Cyclops crassicornis, Miiller. Entomostraca, p. 113, t. xviii, 



figs. 1517 (1785). 



Sars. Oversigt Ferskvandscopepoder 

 p. 47 (1863). 



Uljanin. Reise in Turkestan (Ci'iistacea), 



p. 39, t. viii, figs. 916; t. xii, fig. 1 (1875). 



pauper, Fric. Die Krustenthiere Bohmens, p. 223, 



fig. 20 (1871). 



Body depressed (fig. 1), only slightly attenuated 

 behind ; no distinct separation between thorax and 

 abdomen ; abdomen almost of the same diameter 

 throughout. Anterior antennae (fig. 2) composed of 

 eight short, stout joints ; only about half the length 

 of the first body-segment, densely beset with long 

 hairs, some of which are plumose ; first and fourth 

 joints much the largest. Posterior antennae stout, 

 last joint very short. Mouth organs very small. 

 Outer branches of the swimming feet (figs. 3, 4) 

 strongly spined on the external margin, last joint 

 bearing in the first three pairs three and in the fourth 

 only two spines. Fifth foot (fig. 5) rudimentary, 

 bearing three setae, of which the outermost is long and 

 slender. Margin of last abdominal segment serrated. 

 Caudal rami (fig. 6) somewhat divergent and dis- 

 tant, about four times as long as broad, and nearly 



