Bibliographical Notice. 99 
parts is so conspicuously different in the two species, that 
either one can be recognized at a glance. ‘Two of the adult 
specimens are precisely alike; the third is a little paler upon 
the sides of the head; but all possess the uniform greenish 
black back and wings. 
It gives me great pleasure to bestow upon so handsome a 
bird the name of my friend Professor Alphonse Milne- 
Edwards, so well and favourably known for his many and 
highly important contributions to natural science, and who, 
in the kindest manner, has placed at my disposal all the speci- 
mens of this genus contained in the collection of the museum 
to assist me in my investigation of the group. 

BIBLIOGRAPHICAL NOTICE. 
The American Paleozoic Fossils, fc. By S.A. Mitter. Large 8vo. 
Pp. 253. Published by the Author : Cincinnati, U.8., 1877. 
Tus work consists of a catalogue of the genera and species of 
Paleozoic Fossils found in North America, giving the names of 
authors, dates, places of publication, groups of rocks in which the 
fossils occur, and the etymology and signification of the words, 
together with a preliminary discourse, by Prof. E. W. Claypole, on 
the construction of systematic names in paleontology, and an Intro- 
duction by the author, on the stratigraphical geology of the Ame- 
rican Paleozoic rocks. 
This, we believe, is the latest of many useful catalogues of fossils 
prepared by geologists of different countries, and devoted to the 
consideration of either particular groups or the world-wide distri- 
bution of organic remains. In this case the fossils treated of are 
limited to those of the Paleozoic Rocks of North America, and form 
an extensive list of at least 1000 genera and 8000 species, besides 
very many names (upwards of 2000) which are either synonyms or 
not well determined: 
The organic remains here enumerated are grouped according 
to their Orders, the Families of which are mentioned for each 
division. 
A special feature in this work is a most praiseworthy attempt to 
produce the names with correct etymology and derivation. But 
besides those errors mentioned in the lists of corrigenda at pages 
64 and 246, there are many that have escaped the author’s notice; 
and some of them go to prove how true his observation is that the 
mistake of the original name of a species is perpetuated in succes- 
sive transcripts ; whilst others show, as usual, the difficulty found 
by any one in trying to express himself in a language unknown to 
him. 
Prof. Claypole, both in his excellent essay on nomenclature and 
in revising a great portion of the Catalogue, has evidently worked 
