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



figureH and descriptions of some species which Clans had too hastily 

 treated. 



In 1878 A. Gruber gave descriptions of Two fresh- water Calanidce. 



In the same year the first volume of Brady's fine British Copepoda 

 appeared. A purely technical work and briefly written, it is yet 

 very comprehensive and in the main reliable. This is a worthy suc- 

 cessor of the Ray Society's earliest publication on Entomostraca — 

 Baird's great work. 



In the sixth volume of the Ahhandlungen d. naturwissenschaftUchen 

 Yerein zu Bremen, Herman Rehberg gives a systematic review of syn- 

 onomy, and in the revision unites several species in a manner that 

 the present writer had independently been driven to do. It is prob- 

 ably impossible either to substantiate or positively deny some of this 

 writer's identifications of the species of the older authors. 



This paper also contains an observation of a hermaphorditic Cyclops, 

 which it is interesting to compare with similar anomalies, described 

 by Kurz in Cladocera. 



In the seventh volume of the same periodical, Rehberg adds to and 

 modifies some of the views expressed above. In the same number is 

 a description of a new species of Temora by Poppe. (The same species 

 occurs in the semi-saline waters of the Gulf of Mexico, and had well- 

 nigh gone into print under a new name when this was seen.) 



In the above review we have noticed only the more important 

 foreign works on the Copepoda and those including fi-esh-water forms. 

 Dana's magnificent Crustacea of the Wilkes' Exploring Expedition is not 

 included, because it is essentially restricted to the marine species, the 

 few descriptions of fresh-water species being quite valueless. Among 

 important contributors to the exclusively marine Copepoda, are Boek 

 (^Oversigt over Norges Copepoder and Nye Slcegter og Arter af Saltvands- 

 Copepoder), Brady and Robertson. Lubbock and Glaus. 



The history of the American literature can be quickly traced. 



Say described imperfectly an American species of Cyclops in 1818. 

 Haldeman describes in volume 7, of the Proceedings of Philadel- 

 phia Academy of Science, p. 331, Cyclops setosa (which may be C. ser- 

 rulatus). Pickering very imperfectly described a new genus of Cope- 

 poda from Lake Ontario in Dekay's Zoology of New York. This genus 

 is, most likely, Epischura of Forbes, and, in strictness, ought to rank 

 it. In 1877 appeared A List of Illinois Crustacea, by Professor Forbes, 

 in which two species of Copepoda were described which may rank as 

 the first descriptions, at all adequately framed, of American members 

 of the order. In the Annual Report of the Minnesota State Geologist for 

 1878, a brief article by C. L. Herrick outlined, in the light only of the 

 then English literature, the micro- Crustacea of Minnesota. No at- 



