100 



BRITISH COPEPODA, 



First stage, of 



about 0"4 mm. 



in size 



Second stage 



Third stage 



Fourth stage 



Last stage 



Number of body 

 segments.exclu- 

 sive of furca 



Number 

 of pairs of 



swim- 

 ming- feet 



Condition of brandies of 

 swimming-feet. 



1-joiuted 



First two pairs with 



2-jointed, 



third pair with 



1-jointed branches. 



First three pairs with 



2-jointed, 



fourth pair, with 



1-jointed branches 



As the preceding 



2-jointed 



3 -jointed 



Superior 

 antennae. 



5 -jointed. 



6 „ 



6 „ 



7 „ 



6 „ 



7 „ 



9 

 10 

 10 

 10 

 11 



(a. Anterior antennae 17 -jointed.) 



1. Cyclops signatus, Koch. PI. XVII, figs. 4—12. 



Cyclops signatus, Koch. Deutschlands Crustaceen, &c, H. xxi, 

 tab. viii {fide G. O. Sars) (1841). 



— — G. O. Sars. Oversigt af de indenlandske Fersk- 



vandscopepoder, p. 33 (1863). 



— — Uljanin. Reise in Turkestan (Crustacea), p. 29, 



t. ix, figs. 6—11 ; and t. xi, fig. 8 (1875). 

 Monoculus quadricornis fuscus, Jurine. Histoire des Monocles, 



p. 47, pi. iii, fig. 2 ; and pra- 



sinus, p. 49, pi. iii, fig. 5 (1820). 



Cyclops qaadricomis var. c, Baird. British Entomostraca, p. 203, 



t. xxiv, fig. 5 (1850). 



