104 ANIMAL FORMS 
yet so harmonizing with their surroundings that they are 
as likely to survive as their stronger relatives. In this 
Fic. 61.—Kelp-crab (Zpialtus productus) in upper part of fignre; to the right the 
edible crab (Cancer productus), and the shore-crab (Pugettia richii). 
connection it is interesting to note that the giant crab of 
Japan, the largest crustacean, being upward of twenty feet 
from tip to tip of the legs, is a spider-crab, constructed on 
ae eee 
Fic. 62.—The fiddler-crab (Gelasimus). Photograph by Miss MaRy RaTuyun. 
the same general pattern as our common coast forms. 
Between these two extremes numberless variations exist, 
