Biographical Notice of Alcide D’ Orbigny. 77 
The Bryozoa-Cenirifugina, which form the other division of 
the class, he discovered in almost all the geological formations, 
and he gives their numbers thus :— 
Genera. Species, 
In the Paleozoic ........065 1Dss033 i vw ds 6 
DPNONG 0. focus eee ee ha Cea 0 
— Jurassic ........e eee ih EE A. Se Cs 93 
Gretacecta: 50. 2 O24 NE fee SE 480 
Tertiary ........ MOI GE A 101 
—— Existing epouh s....... » | SS eae 80 
And he concludes from the whole that there were three centres of 
development of the Bryozoa, the first two composed of B. Cen- 
trifugina ihe lane , one in the Carboniferous stage of the 
Paleozoic, and one in the Bathonian of the Jurassic,—and the 
_ other composed of both orders, Cellulina and Centrifugina, in 
the Senonian stage of the Cretaceous. 
_ Having now, I trust, enabled every one to form a correct 
Judgment of the great and varied abilities of Mr. D’Orbigny, in 
aid of whose researches the Society has twice awarded the pro- 
ceeds of the Wollaston Fund, I will close my remarks with the 
following passage from the report of Messrs. Brongniart, Dufré- 
hoy, and Hlie de Beaumont, on his “Geology of South America,” 
a it conveys a sentiment in which all our members will, I am 
Sure, cordially concur:— * 
_,, -he author's reserve, in treating upon a subject so vast and 
difficult, cannot but be approved, although no one can fail to 
Perceive that the memoir of M. D’Orbigny has enriched science 
With a great number of new facts and with many ingenious 
Speculations. New observations may hereafter lead to a modifi- 
1on of some of his theoretical views; but the merit will 
always be his of baving considered a vast subject from a point 
observation so elevated as must necessarily cause it to com- 
mand attention, and lead the way to still further progress. 
ore propose to the Academy that it should express to the 
author the high satisfaction it has experienced in contemplating 
the indisputable advancement which has been m de towards a 
knowledge of the geology of South Ameri by his courageous 
and persevering researches :”—let me also add, towards a knowl- 
edge of the geology of all parts of the earth; for his great works 
on the Palzontology of France deserve such comm 
