326 History of Britisli Entomostraca. 



animal, and are sufficient, he considers, to constitute it into a dis- 

 tinct species, named by him C. lacinulatus. At first observing them, 

 Jurine says he was disposed to consider them also peculiar organs, 

 and that it was a distinct species. After very attentive observation, 

 however, he found the number to be irregular ; and sometimes he 

 found them in males adhering to the base of the posterior feet ; he 

 found them to separate spontaneously from the body of the animal, 

 and, in short, discovered them to be nothing less than animalcules, the 

 base upon which they were planted being a kind of moss, with which 

 these insects are often covered. Jurine says that it is in the months 

 of March and April that these insects are to be met with ; but the 

 only time I ever saw a specimen with these peculiar bodies adher- 

 ing was in the month of October. It was taken from Yetholm Loch, 

 Roxburghshire ; but an accident occurring to the vessel in which 

 they were placed, prevented me from any lengthened observations 

 upon them. I have not met with the C. cseruleus of Muller; but 

 Jurine distinctly asserts, that the three species of Muller, caeruleus, 

 rubens, and lacinulatus, are mere varieties of one species; and 

 which, from the resemblance he fancied he saw in the tail of the fe- 

 male, when loaded with eggs, to that of the beaver, he has named 

 Monoc. Castor. It is a very beautiful species, and is the most ele- 

 gant of all we know. " Son port," says Jurine, " est elegant ; sa 

 maniere de s'elancer dans la liquide est noble et hardie ; ses mouve- 

 mens sont libres et faciles ; tout enfin annonce chez lui une supe- 

 riorite qui characterize la grandeur de l'espece a laquelle il appar- 

 tient." 



3. Cyclops minutus, Plate IX. Fig. 1-14. Specific Character — Antennis Cur- 

 tis ; corpore lineari ; Cauda biloba ; lobo utroque setis duobus insequalibus 

 instructo ; ovario externo unico. 



Synonimes, Sfc Canthocarpus Staphylinus, J. O. Westwood, Lardner's Cab. 



Cycl. (ined.) 



Cyclops staphylinus, Desmarest, Consid. gen. sur les Crustaces, p. 363. 



Monoculus staphylinus, Jurine, pp. 74-84, pi. 7, fig. 1-19. 1820. 



Cyclops minutus, Ramdohr, pp. 10-13, tab. iii., fig. 1-9. 1805. 



Monoculus minutus, Fabricius, Tom. ii. p. 499, No. 45. 1792? 



Cyclops minutus, Muller, p. 101, tab- xvii. fig. 1-7. 



Amymone (young state,) Muller, p. 42, tab. ii. 1785. 



Eichhorn, Beytrage zur Naturg. der Kleinsten Wasserthiere, p. 53, tab. v. fig. 

 K, L. 1781. Very bad figures. 



Do. do. (young state,) p. 41, tab. iii. fig. p. 



Satyr, Baker, Employ, for Micros, (the young state,) p. 314, pi. 12, fig. 23^ 

 25,26. 1764. 



Philosophical Transactions, No. 288, for November and December, 1703. 



Habitat Pools and ditches. Common all the year round. 



