198 BRITISH ENTOMOSTRACA. 



This family contains the following genera : — 



1. Cyclops. — Foot-jaws large and strong-branched; 

 antennules simple ; ovaries double. 



2. Canthocamptus. — Foot-jaws small, simple ; anten- 

 nules simple ; ovary single. 



8. Arpacticus. — Foot-jaws forming strong clieliform 

 hands ; antennules simple ; ovary single. 



4. Alteutha. — Foot-jaws small, simple ; body flat ; 

 two strong falciform appendages from tifth segment of 

 body. 



Genus 1 — Cyclops.* 



Cyclops, Miiller, Latreille, Desmarest, M. Edwards, Koch, &c. 

 MoNOCULUS, Linn<Bus, Fabricius, Jurine, &c. &c. 



Character. — Foot-jaws large and strong, branched. 

 Antennules simple. Ovaries double. Both antennae in the 

 male possessed of the swelling and hinge-joint. 



1. Cyclops quadricornis. Tab. XXIV, figs. 1-10. 



MoNOCULTJS QTJADKicoRNis, Linnaus, Paun. Suec, No. 2049, ] 74G ; 



Syst. Nat., edit. 10th, i, 635, No. G ; 

 edit. 12tb, 1058, No. 6. 



— Gmeliii, Liim. Syst. Nat., edit. 13th, i, 



2996, No. 6. 



— Scopoli, Eutomologia Caruiolica, 413, 



No. 1139. 



— Fabricius, Syst. EntomoL, 295. 



— Jurine, Hist. Nat, Monoc, 1-49, 1. 1, 2, 3, 



— Sulzer, Insecten, t. 30, f. 9 b. 



— Donovan, Hist, of Brit. Ins., i, 7, t. 2, 



f. 1-5. 



— Blumenbach, Handb. der Naturg., 399, 



No. 4. 



— Manuel, Enc. meth., vii, 718. 



— Barbut,Gi&n. Insect. Linn.,tab. xx, gen. xi. 



— Shaw, Nat. Miscell., xxi, t. 904. 

 MoNocuLus Apus, i'ofi?^, Inscct. Mus.Gi-fecens., 125, 1. 1, f. 11, 12, 1761. 

 Le Monocle A queue fourchue, Geoffroy, Hist, abreg. Ins. Par., 



ii,650,No.3,t.21, f. 5, 1761. 



* KukXwi^ — from kvkXoq, orbis; and w;//, oculus. 



