ENTOMOSTRACA OF MINNESOTA. 43 
Fischer, who contributed not a little to our knowledge of the dis- 
tribution of fresh-water Cladocera, was the next to describe valid spe- 
cies. He described the species found near Moscow and St. Peters- 
burg, Russia. 
The justly famous Swedish naturalist, W. Lilljeborg, who has left 
his mark on so many branches of natural science, has not neglected 
the microscopic Crustacea of his fatherland. Om de inom Skaane foere- 
kommande Crustaceer af ordningarne Cladocera, Ostracoda och Copepoda, 
is the somewhat formidable title of his work, published in 1855. He 
recognized the following genera of Copepoda: Diaptomus, Temora, Dias, 
Ichtyophorba, Tisbe, Tachidius, Harpacticus, Canthocamptus, and Cyclops. 
A species each of Diaptomus and Canthocamptus is described, and 
two species of Cyclops. (It would seem from authors’ quotations that 
other species are described in an appendix, but the copy I have seen 
lacks this.) The author who has done most for micro-carcinology in 
general is Carl Claus of Vienna. His principal works are: 
1. Das Genus Cyclops, etc. In Wiegmann’s Archiv fiir Naturgeschichte, 
1857. 
2. Weitere Mittheilungen ueber die einheimischen Cyclopiden, The same, 
1857. 
3. Die Freilebenden Copepoden, 1863. 
The later work especially is indispensable to the student of Cope 
poda, though in reality it is more important in respect to marine Co- 
pepoda., 
In the meantime a work appeared in Norwegian, with Latin de- 
scriptions, from the pen of G. O. Sars. This has been largely over- 
looked. It is, unfortunately, unaccompanied by plates, but the de- 
scriptions bear the stamp of the naturalist. 
A little later a second brief contribution from this author was pub- 
lished, but I have not seen it. 
Sir John Lubbock in 1863 describes species of fresh-water Copepo- 
da, but the publication seems no longer necessary. 
Heller, in Tyrol, Fric, in Bohemia, and Uljanin, in Asia, have 
studied the Oopepod fauna. 
A Russian paper by Poggenpol and Uljanin is quoted as 4 Cata- 
logue of the Copepoda, Cladocera and Ostracoda of the vicinity of Moscow, 
by Rehberg, and as from the Protokolle der kais.-naturw. anthropol. und 
ethnogr. Ges. in Moskau, but by Cragin, who publishes a translation 
apparently of the same paper in part, as from the Bulletin of the 
Friends of Natural History. 
Hoek, in the Tijdschrift der Nederlandsche Dierkundige Vereeniging 
(Magazine of the Zoological Society of the Netherlands), 1875, and later in 
German in the Miederlaindisches Archiv fiir Zoologie, gave excellent 
