258 ` Progress of Invertebrate Paleontology in [ April, 
Professor A. Winchell has an investigation of the Cephalopods 
.of Tennessee nearly completed, and is also pursuing his investi- 
gations of the Stromatoporide. 
The writer of this article has published in Vol. v, of the Bulle- 
tin of the United States Geological Survey of the Territories, the 
three, following “Paleontological Papers:’ No. g—“ Fossils of 
the Jura-trias of South-eastern Idaho,” pages 105-118; No. 10— 
“Conditions of Preservation of Invertebrate Fossils,” pages 
130-142, and No. 1 1—“ Remarks upon certain Carboniferous Fos- 
sils from Colorado, Arizona, Idaho, Utah and Wyoming, and cer- 
tain Cretaceous Corals from Colorado, together with descriptions 
of new Forms,” pages 209-221. He has also in the same volume, 
pages 143-152, in connection with Prof. H. Alleyne Nicholson, 
a supplement to the Bibliography of North American Inverte- 
brate Paleontology. The March number of the American Four- 
nai of Science and Arts also contains an article from his pen 
entitled, “Remarks on the Jura-trias of Western North 
America.” 
The most important of these papers is No. 9, relating to the 
discovery of Triassic types in the region indicated, the epoch of 
the Muschelkalk of Europe being fully recognized. It is in this 
paper that the new genus Meekoceras of Hyatt is diagnosed. . 
The writer has also in press a series of Contributions to Inver- 
tebrate Palaeontology, seven in number, illustrated by thirty-eight 
lithograph plates. The first portion with ten plates has just 
been published separately, and is to appear in the Annual Re- 
port of the U. S. Geological Survey of the Territories for 1877, 
and the remainder in that for 1878. The fossils described and 
illustrated are from the following formations: Carboniferous, 
Triassic, Jurassic, Cretaceous, Laramie and Tertiary. A large 
proportion of these species have been described by the writer 
in different publications of the surveys, formerly in charge 
of Dr. Hayden and Prof. Powell respectively; a part are therein 
described for the first time, and the remainder are species that 
have, by different authors, been described in various publications, 
but not illustrated. These descriptions last referred to are mostly 
by the late Mr. F. B. Meek and Dr. B. F. Sherward. It has been 
the aim of the writer to illustrate all the species described by 
these two authors as well as others, so far as practicable ; and when 
the volumes in question appear, there will remain 1 comparatively 3 
