576 TRANS. OF THE ACAD OF SCIENCE. 
form and general arrangement of the cells or chalices; while 
for specific distinctions we are restricted to narrower limits, or, 
to indicia of minor importance, such as the relative size and 
form of the cells, their number and distance apart, and some- 
times to phenomena of a purely negative character. 
These principles, when more accurately defined and limited 
to their proper sphere, may lead to a more correct classifica- 
tion, or a more natural arrangement of the Polyzoa than 
those which have been previously proposed. It must be ad- 
mitted that the present classification is almost as defective in 
Polyzoology, as when the profound and gifted mind of D’Or- 
bigny essayed to establish order where the wildest confusion 
had previously prevailed. In all deference to his genius and 
ular spaces, and its sole ¢ 
from the Coscinium with a 
formed of approximating .d inter = 
tetes with its more condense | 
