Association of American Greologists and Naturalists. 349 
On Entozoa.—Dr. J. Wyman. 
On the Fossil Osteology of North America.—Dr. J. Wyman. 
On the Geological distribution of Minerals.—J. D. Dana. 
On the Chemical relations of the American Coals.—W. B. and 
R. E. Rogers. 
On the Chemical and Economical Relations of the Green 
Sand of the United States.—J. B. Rogers and C. T’. Jackson. 
On the Native Compounds of Lime, Magnesia, Iron and 
Manganese.—Martin H. Boyé and James C. Booth. 
On the E'vaporating Power of various Coals.—W. R. John- 
son. . 
On the Comparative Ichthyology of the Coast of North Amer- 
ica and E'urope.—D. H. Storer. 
On the Fossil Fishes of the United States—John H. Redfield. 
On Volcanic Phenomena and the Distribution of Volcanoes.— 
J. L. Hayes. 
On Drift Phenomena.—Prof. E. Emmons, fox the New Eng- 
land states and New York; J. N. Nicollet,* for the West and far 
West; W. B. Rogers, for the Southern boundary. 
Afternoon.—Mr. Hall read a paper upon the Crinoidea of the 
rocks of New York, their geological and geographical distribution. 
These may be regarded as the most singular and beautiful fossils of 
our older rocks. When found in all their gorgeous perfection, they re- 
mind one of the fanciful creations of some fairy tale; and the glowing 
descriptions of the coral groves of our tropical seas can be in some de- 
gree appreciated. 
If we find their external and general characters beautiful, their more 
minute and intricate structure is often still more curious and interesting. 
Mr. H. referred to the ingenious work of Miller, published in Eng- 
land in 1821, as the groundwork on which we are enabled to found ge- 
neric distinctions. Mr. Say’s descriptions of the Caryocrinus ornatus 
and C. loricatus are almost the only scientific descriptions of Crinoidea 
with which I have met. Some notices and figures of other species from 
different parts of the country, serve to show how rich are our rocks in 
these remains. 
Here follows a short description of the general structure and habits 
of these animals. In some species the mouth, composed of small tri- 
angular plates, shows a close analogy with the Echinidea. The deli- 
cate structure of this class of animals, rendered them peculiarly liable 
to destruction upon slight causes ; and their immense numbers are only 
* Since deceased, Sept. 11, 1843. 
