152 



THE ANIMALS AND MAN 



known measuring twelve to sixteen feet from tip to tip of 

 extended legs; the carapace is only as many inches in width 

 or length. The soft-shelled crab is a species common along 



Fig. 62. Some crabs and barnacles of the Pacific Coast; the short sessile 

 acorn barnacles in the upper left-hand corner belong to the genus 

 Balanus; the stalked barnacles in the upper right-hand corner are of 

 the species Pollicipes polymenus; the largest crab (upper left-hand) 

 is Brachynotus nudus; the one in left lower corner is a young rock- 

 crab, Cancer productus; the one in the seaweed at the right is a kelp 

 crab, Epialtus productus! while the 'two in snail-shells in the right 

 lower corner are hermit-crabs, Pagurus samuelis. (About one-half 

 natural size; from living specimens in a tide-pool on the Bay of Mon- 

 terey, California.) 



