CYCLOPID^. 185 



time,* with the exception of detached notices, such as I 

 have mentioned above, one species only of this family 

 seems to have been noticed by authors, which, like all 

 the other Entomostraca then known, was arranged and 

 described under the general name Monoculus. He was 

 the first, as I have already mentioned, to divide the dif- 

 ferent animals which figured under this name into dis- 

 tinct genera ; and having discovered in the marshes and 

 on the shores of Denmark and Norway, a variety of 

 species, all agreeing in many characters with each other, 

 he formed them into one distinct genus, and gave the 

 name of Cyclops to it. He has given a number of inter- 

 esting particulars of many of these little creatures, but 

 has fallen into two or three mistakes concerning them, 

 which will be pointed out hereafter. 



Some time after Muller, Ramdohr, in 1805, published, 

 in his little work on the Monoculi, f a very correct account 

 of the anatomy, &c. of three species found in fresh water, 

 accompanied with plates, which possess very considerable 

 accuracy, and traces their whole transformation from the 

 egg to the perfect animal. 



Louis Jurine j (pere) some years afterwards published 

 his excellent monograph, and in it has given us the fullest, 

 most interesting, and most accurate information upon the 

 fresh- water species belonging to the family, of any author 

 who has written upon the subject. He declines the name 

 of Cyclops, which Miiller had given it, and prefers the old 

 term Monoculus ; but he has rectified the mistakes which 

 that naturalist had fallen into, and completed, by a series 

 of wonderf idly careful experiments, the previous discoveries 

 of Leeuwenhoek and De Geer. This he had done, with- 

 out even alluding to the labours of Ramdohr, and indeed 



* " Uniciuu quidem aute annum 1769, quo in Synopsi Monoculorum quatuor 

 iiovas Cyclopes Jluviatiles public! juris feci, iiempe Monoculus quadricornis 

 Eiitomologis imiotuit." Eutomost., 100. 



f Beytrage zur Naturgesckichte eiuiger deutscheu Monoculus-arten. ito, 

 ilullc, 1S05. 



J Histoire dc.-> Monocles qui sc trouvcut aux Environs dc Geneve, 1820. 



