CYCLOPIDiE. 
183 
Family 1— CYCLOPUEE. 
Pseudopoda (pars), Leach, Edin. Enc., vii, 384, 1814. 
— Latreitte, Gen. Crust, et Ins., i; Hist. Nat. Crust., iv, 356, 
(exclus. gen. Argulus). 
Monoculi (pars), M. Edwards, Hist. Nat. Crust., iii, 423, 1840. 
Cyclopidees, Leach , Diet, des Scien. Nat., xiv, 524 (exclus. gen. Poly- 
phemus), 1819. 
— Desmarest, Cons. gen. sur Crust. 
CYCLOPiDiE, Baird, Trans. Berw. Nat. Club, ii, 1845. 
Character . — Head not distinguishable from body, being 
consolidated with the first segment of thorax. Foot-jaws 
two pairs, generally small. Legs five pairs ; the fifth pair 
rudimentary. One eye. Both antennae, in male, fur- 
nished with the swollen hinge-joint. 
Bibliographical History. — The first notice of any sub- 
ject of this family that T am aware of, is to be found in a 
little work of Stephanus Blancardus, the ‘ Schou-burg der 
Rupsen, Wormen, Ma’den, &c. 5 published at Amsterdam 
in 1688. His notice of it is however very brief, and the 
figure which he has given is very bad ; being barely 
sufficient to enable us to make out that it is the Cyclops 
quadricornis he means to represent. 
Leeuwenhoek appears to have been the next to take 
particular notice of any individual belonging to the family. 
In his ‘ Epistolae ad Societatem Regiam Anglicam/ &c. 
(Epistola 121, written in 1699) he gives numerous details 
of an insect which he found in fresh water, and whose 
habits he seems to have studied with considerable atten- 
tion. He gives a figure of it also, which, though far from 
being correct, suffices to show us that his insect is likewise 
the Cyclops quadricornis. His observations upon it are 
very interesting, and he discovered, among other things 
worthy of note, the great difference there is between the 
young and the old animals, though he did not carry his 
observations so far as to trace the transformations which 
take place. 
