IVORMS, CRAYFISH, CEhlTIPEDS, ETC. 



155 



among which they live. The spider-crabs are especially 

 strange-looking creatures, with unusually long and slender 



Fig. 113. — 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 01 

 M\k ^\>ftz\ts Pollicipes polymeniis; the largest crab (upper left-hand) is 

 Brachynot'Hs nudtis; the one in the left-hand lower corner is a young 

 rock- crab, Cancer proihiclus; the crab in the seaweed at the right is a 

 kelp-crab, Epialtiis produchis, while the two in snail-shells in lower 

 corner are hermit-crabs, Pagurits samtie/is. (About one-half natural 

 size; from living specimens in a tide-pool on the Bay of Monterey, 

 California.) 



legs and a comparative!}^ small body-trunk. They include 

 the Macrocheira of Japan, the largest of the crustaceans. 

 Specimens of this crab are known measuring twelve to six- 



