44 GEOL. AND NAT. HIST. SURVEY OF MINNESOTA. 
figures and descriptions of some species which Claus had too hastily 
treated. 
In 1878 A. Gruber gave descriptions of Two fresh-water Calanide. 
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 Abhandlungen d. naturwissenschaftlichen 
Verein 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 fresh-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 Slegter og Arter af Saltvands- 
Copepoder), Brady and Robertson, Lubbock and Claus. 
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, Hpischwra 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- 
