196 J. D. Dana on Zoophytes. 
dra, (figs. 2 and 3,) they usually form compound groups, hundreds 
and often thousands to a cluster. Some, as in the annexed fig- 
ure* (fig. 1,) grow in crowded tufts or thread-like stems; ma- 
Fig. 1, 
wet. e 
semblance to other infusoria. The effect mentioned depends on the nature of the 
process of nutrition, which i is of more importance than the motion of vibratile 
cilia. The principles ceo us fake on  vignhity. 5 f ‘hat the animal fopcueyY con- 
sist more or less comple 
ation prcoonrestly going on in the > organism. Now, it appears to be a del whieh per 
oy rest; re is af in pialecaipe forces: + as well as alternate seuign rn bah 
the Operations of life. Conse and 
growth, going on in a monad, pit give alternate or senda action to the cilia or 
other means of motion ; and if sufficiently minute, and free to move, the organism 
will have progressing motion, whether plans or siege No perveus ayaa. is ne- 
cessary rate 
higher 
os 
bs 
power ; in a higher plant, there is no natious ayatem, and little concentration, and 
organism remains fixed without motion. Owing to the constitution of the 
plant, 1 the action on air results in giving out oxygen, and it appropriates inorganic 
substances as nutriment: and for a like reason the animal gives out carbonic acid 
on peapiration, and a mgeg mostly on organic 
These figures y a.F. Couthouy,. and represent a species from Rio de Ja- 
; neiro, whieh be iin Tubularia ornata. Fig. 1 shows the animal of natural 
size. These. ural shoved totettine be. 2, 3 end 5, are copied from 
Report on Zoophytes by the author. 
"Snare view on eso May Ma, 38 8 
