AMERICAN 
JOURNAL OF SCIENCE AND ARTS. 
[THIRD SERIES.] 
e 
Art. XXX.—On Cephalization ; by James D. Dana. Part V. 
Cephalization a fundamental principle in the Development of 
the System of Animal Life. 
8 
abe with the rising grade, an abbreviation relatively of the 
: omen, an abbreviation also of the cephalothorax and of the 
ntenn and other cephalic organs, and a compacting of the 
Structure before and behind ; a change in the abdomen from 
ormer papers on Cephalization, see this Journal, Il, xxii, 14, 1856; 
) Xxxvi, 1, 159, 321, 440, 1863 ; Sit 10, 157, 1864 ea, Fong 1866. 
in i viz: 
Pod to the Decapod type, or from Insect 
The latter 18 plainly a structural transfer, the two anterior pairs of lim _th 
Crustacean, or the one in the Insectean class, becoming, by the transfer, strictly 
of eetieg nnn (pertaining to the mouth series), and existing thus in a be 
among _ But in man it is properly only a ional transfer, analogous to cases 
serve Spiders and Tuichdesigeds. weve the anterior legs become adapted to 
Place functionally the mouth or ithout that st which woulda 
se of itself order. 
Sc 
1.—Tuirp Series, Vou. XII, No. 70.—Oct., 1876. 
16 
