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' ENTOMOSTRACA OF MINNESOTA. 45 
tempt was made to treat the Copepoda, but two species of Diaptomus 
are indicated which will prove valid. Occasional papers in the 
American Naturalist and elsewhere follow, till, in July and August of 
1882, Professor Forbes added two new genera and several species of 
Copepoda, constituting by far the most considerable addition to the 
subject yet produced. 
In the Report of the State Geologist of Minnesota for 1881, C. L. Her- 
rick makes a considerable addition to the knowledge of American 
Cyclopide, enumerating ten species, of which six seemed new. This 
writer also describes a new genus and several new species of Calanide, 
some of which unfortunately are identical with those described by 
Forbes and published about simultaneously. 
In April, 1881, V. T. Chambers gave an account of a species of the 
Harpacticide, referred by him to Zachidius. The species is especially 
interesting on account of its novel habitat. Zachidius (?) fonticola Cham.» 
is found in saline waters of Big Bone Springs, Ky., and is thus very 
distant from its marine congeners. It is perhaps doubtful if its gen- 
eric reference can be sustained, but the species is of great interest. 
The Diaptomus described by the same author is not recognizable. 
Several articles in the Naturalist bring the bibliography up to May, 
1883, when F. W. Cragin published in the Trans. Kansas Academy of 
Science, A Contribution to the History of the Fresh-water Copepoda. In 
this paper ten species of Cyclops are described or mentioned. The 
author ignored previous American literature and thus adds somewhat 
tosynonomy. The plates are lithographic, and are carefully, if not 
artistically, prepared. A valuable feature is the translation of the 
descriptions of Poggenpol’s species from the Russian. 
These papers, together with the outline presented beyond, it is 
hoped, will form a basis for future work. 
To the above, which is reproduced without change from the first 
edition, it may be added that there has been a considerable degree of 
desultory activity in the study of the Copepoda in Europe since the 
appearance of this work. This has been especially marked in the 
case of the Calanide, and, in particular, in the genus Diaptomus, in 
which the confusion resulting from confounding many species under 
one name has been finally removed and the real specific characters 
differentiated. Among the most important of these papers are the 
following: De Guerne and Richard: Revision des Calanides @ Eau 
douce; Brady: Revision of British species of Fresh-water Cyclopide and 
Calanide; Schmeil: Deutschland’s Freilebende Siisswasser Copepoden:- 
American literature since 1884 has been but little augmented, the fol- 
lowing papers being the only important ones: Herrick: Contribution 
to the Fauna of the Gulf of Mexico and the South, 1887; Forbes: On Some 
