J, D. Dana on Cephalization. 165 
cephalic center, and the degree of subordination to it in the structure. 
The following are some of the ways or methods in which it is manifested. 
‘ith superior cephalization, that is, as species rise in grade or rank, 
more and more of the anterior part of the body, or of its members, 
renders service to the head; with inferior, less and less. 
more and more elongated, and spaced out or enlarged. 
(3.) With superior cephalization, the posterior portion of the body 
becomes more and more compacted, or firmly put together and abbrevia- 
ted; that is, as concentration goes on anieriorly, there is abbreviation 
teriorly. Even the tail shows grade; for great length, or size, or 
functional importance is actually a mark of inferior grade, other things 
being equal 
+ 
system of life within can properly wield, and in this case the body is 
stupid and sluggish.” 
The question as to the condition of the life-forces thus passes 
from the sphere of speculation to one of direct observation. As. 
18 so obvious, that the muscular or motorial force 0 the two 
might be sufficiently well represented by the annexed figures: 
figure 1 corresponding to that of the Lion, 4 
and 2, to that of the Right Whale, A being 
the anterior or cephalic extremity and P Beco 
the posterior or caudal extremity. The 
Sensorial forces of the Lion were taken | 
Into consideration, the contrast between 4a 
still : 
the two would be greater. cis the ile 
position of the prime systemic center ; its remoteness from the 
front margin in the Right Whale, (figure 2) is one of the marks 
of the extreme decephalization of the structure. (See on Cephali- 
; ‘he arrangement of the muscular force in dif- 
cht be represented by in diate 
Yo. III. 
Herbivores migh 
nl and 2. 
