504 PROCEEDINGS OF SCIENTIFIC SOCIETIES. 
dies and Central Pacific, it will be necessary to suppose that they were 
created gan rately, as we find them, each adapted to its province; or 
else that they have descended from common ancestors, becoming 
si ep ici by natural selection or otherwise, and pointing to 
an earlier, very ancient, and extensive connection between the two 
eans. 
Prof. O.C. Marsh exhibited some remarkable fossil Sponges from the 
Lower Silurian of Kentucky, for which he had recently proposed the 
new genus Brachiospongia. The type of the genus was B. Remerand, 
and several other species have recently been discovered. These forms 
v nlike any known ‘sponges, recent or fossil, and are of great 
Scientific interest. A full description of them will soon be published. 
“On certain Effects produced upon Fossils by Weathering. > ay 
Professor OU C. Marsh. Certain ena tay in some fossil shells, 
different genera on the same specimen. This is very often the case 
with Ceratites nodosus, from the Trias of Germany. 
— This number is devoted largely to the a Hg of the 
Pensa apie cgi for the Advancement of Science. In order to 
make room for the valuable and interesting address of the President, 
and the abstracts o; y ers read in the Natural History Section, we 
have crowded out articles and illustrations originally intended for 
mber. 
We trust all our readers will feel an interest in the growth and 
uccess of the American Association, whose meetings are doing 
so much for the diffusion and advancement of Science in this country, 
and prove such pleasant reunions for all interested in the cause 
The abstracts of the papers will be continued in future numbers. 
BOOKS RECEIVED. 
ife Beneath the Waters; or the Aquarium in America. By Arthur M. E 
New York, 1858. Izmo. Tiustrated. se `- Islands, Hion) 
Parasite, or Cat illar Fungus, from the Philippine Ps 
Dr. Samuel d Spesland, and. (Erom the 1 Proceedings "Boston Society Natural History 
gso: of the Geo! 
and its vicinity ; prepared by L. Von 
$ for Schools and Academies. By L. C- 
Co. 1867, 
Motes on: ai anada, and o 
merae te EEEE OTAS yaa Dawson Li Da wi with Notes 
by W. pic ing oe the Proceedin logical 
Boctety. , May 8 IN 
