CYCLOPID^:. 183 



Family 1 CYCLOP1D2E. 



PSEUDOPODA (pars), Leach, Ediu. 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. geu. Poly- 

 phemus), 1819. 



Desmarest, Cons. gen. sur Crust. 

 CrcLoriD.E, 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 I am aware of, is to be found in a 

 little work of Stephanus Blancardus, the i Schou-burg der 

 Rupsen, Wormen, Ma' den, &c.' 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 c Epistolse ad Societatem Regiam Anglicam,' &c. 

 (Epistola 12L, 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. 



