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 cheliform 
hands ; antennules simple ; ovary single. 
4. Alteutha. — Foot-jaws small, simple ; body flat ; 
two strong falciform appendages from fifth segment of 
body. 
Genus 1 — Cyclops.* 
Cyclops, Muller , Latreille, Desmarest, M. Edwards, Koch , &c. 
Monoculus, Linnaeus, 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 quadricornis, Linnaeus, Faun. Suec., No. 2049, 1746; 
Sjst. Nat., edit. 10th, i, 635, No. 6 ; 
edit. 12th, 1058, No. 6. 
— Gmelin, Linn. Syst. Nat., edit. 13th, i, 
2996, No. 6. 
— Scopoli, Entomologia Carniolica, 413, 
No. 1139. 
— Fabricius, Syst. Entomol., 295. 
— Jurine , Hist. Nat. Monoc., 1-49, 1. 1, 2, 3. 
— Suker, 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, Gen. Insect. Linn.,tab. xx, gen. xi. 
— Shaw, Nat. Miscell., xxi, t. 904. 
Monoculus apus, Foda, Insect. Mus. Grsecens., 125,t. 1, f. 11, 12, 1761. 
Le Monocle A queue fourchue, Geoffroy, Hist, abreg. Ins. Par., 
ii, 656, No. 3, t. 21, f. 5, 1761. 
* K vkXoj^P — from kvkXog, orbis ; and oculus. 
