FBESH-WATEll Cl'CLOPIDiE AND CALANIDylil. 71 



to the antennae. The measurement given by continental authors 

 is about twice that of British specimens. 



C. elongat'us was found plentifully in a gathering sent to me 

 by the Hev. Dr. Norman, F.E.S., from "pools near Broomley 

 Lough, Northumberland." This is the only British habitat 

 known to me. 



B. Anterior antennm seventeen-jointed, 



a. Reaching, when veflexcd, beyond the posterior margin of the 

 first somite. 



2. Cyclops signalus, Koch (PI. II., fig. 5). 

 Antenna ivith serrated ridge. 



1820. Monoculus quadricornis alhidus^ Jurine (3), p. 44, pi. II., 



figs. 10, 11. 

 1841. Cyclo2)s signatus, Koch (4), H. 21, tab. YIII. 

 1850. ,, quadricornis var. c, Baird (7), p. 203, 



pi. XXIY., fig. 5. 

 1857. ,, coronatus, Claus (13), p. 29, pi. II., figs. 1-11. 

 1863. ,, ,, Claus (18), p. 97, pi. IL, fig. 16; 



pi. X., fig. 1. 

 1863. ,, signatus, Gr. 0. Sars (20), p. 33. 

 1863. ,, coronatus, Lubbock (19), p. 199. 

 1872. ,, ,, Pric (24), p. 218, fig. 11. 



1874. ,, Clausii, Poggenpol (26), p. 70, pi. XV., 



figs. 4-14. 



1875. ,, 5/yw«i!ws, Uljanin(28), p.29, pl.IX.,figs.6-ll, 



pi. XL, fig. 8. 



1876. ,, coronatus, Hoek (29), p. 12, pi. III., figs. 1-11. 

 1878. ,, signatus, Brady (32), p. 100, pi. XVIL, 



figs. 4-12. 

 1883. ,, ,, var. fasciacornis, Cragin (40), p. 3, 



pi. IL, figs. 1-14. 



1885. ,, „ Daday. (44), p. 208. 



1886. ,, „ Yosseler (46a), p. 189, pi. lY., 



figs. 1-5. 

 Antenna loith simple ridge. 



1820. Monoculus quadricornis fuscu^s, Jurine (3), p. 47, pi. III., 



figs. 2-4. 

 1850. Cgclops quadricornis, yawh. Baird (7) p. 202, pi. XXIY., 



fig. 4. 

 1857. ,, ^ewmcorms, Claus(13),p.31,pl.III., figs.1-11. 

 1863. ,, ,, Claus(18),p.99,pLL,fig.3,-pl.IL, 



fig. 17; pLIY., fig. 5. 

 1863. ,, annulicornis, G. 0. Sars (20), p. 34. 

 1863. ,, tenuicornis, G. 0. Sars (20), p. 33. 



