104 



ANIMAL FORMS 



yet so harmonizing with their surroundings that they are 

 as likely to survive as their stronger relatives. In this 



FIG. 61. Kelp-crab (Epialtus 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 



FIG. 62. The fiddler-crab (Gelasimus). Photograph by Miss MARY RATHBUN. 



the same general pattern as our common coast forms. 

 Between these two extremes numberless variations exist, 



