42 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 



As we are dealing primarily with the fresh-water species, no 

 lengthy description of the group is here necessary. 



The earlier history of our knowledge of the animals of this order is 

 given by Baird. According to this authority, the first to mention 

 any fresh water species of this group was Stephan Blankaart,* in his 

 ScJiouhurg der Rupsen, Wormen, Madden, en vliegende Diekens tot Amster- 

 dam. Leeuwenhoek adds numerous interesting details, and is accredited 

 by Hoek with being the first to discover the relation between the 

 remarkably diverse stages which occur in the history of the CycJops. 

 However, it is evident that he had a very incomplete knowledge of 

 the metamorphoses. 



De Geer gives rather characteristic figures of a Cyclojys in Memoires 

 pour servir a V Hisioire des Insectes, vol. vii, 1778. 



Mueller, in his great work on Entomostraca, adds new facts, defines 

 species and forms the genus Cyclops. 



Eamdohr, in 1805, gave sundry additions to the knowledge of these 

 animals in his Beitriige zur Naturgeschichte einiger DeutscJien Monoculus- 

 arten. In this work the post embryonic history is quite fully outlined. 



Jurine, in his classic work Ilistoire des Monocles qui se trouvent aux 

 Environs de Geneve^ 1820, crystallized what previous authors as well as 

 his own original experiments had brought to light of the anatomy and 

 biology of these animals. 



Ferussac (Memoire sur deux novelles especes d' Entomostraces) re- 

 describes known species. 



Gunner, Stroem, and Viviana seem to have had little effect on the 

 knowledge of the group, though they wrote prior to Jurine. 



A recent author attempts to revive the names of Jurine, though 

 hitherto it has been thought hazardous to attempt a specific identifi- 

 cation. 



The German author, C. L. Koch, who only incidentally studied 

 this group, distinguished more or less perfectly a variety of species 

 which have been reinstated in our literature by Eehberg, Although 

 this proceeding seems quite unjust to the careful authors whose de- 

 scriptions are recognizable in themselves, the law of priority must 

 probably prevail. Koch's Deufschlands Krustaceen appeared in 1838. 



Baird' s British Entomostraca, without greatly extending our knowl- 

 edge of this order, put in readable form and made available to English 

 readers what was known, and added interesting facts. He distin- 

 guished two families of Copepoda, (1) Cyclopidce, (2) Diaptomidce. The 

 first included the genera (1) Cyclops, (2) CantJiocamptus, (3) Arpacticus, 

 (4) Alteutha; and the second the genera, (1) Diaptomus, (2) Temora, 

 (3) Anomlocera. 



* Latinized Stephanus Blanchardtis. Hoek recognized Cyclops brevicaudatus or C. hicuspidalns as the 

 ong described, chiefly through knowledge of the present inhabitants of the locality. 



