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H. C. STEVENS 



II. EXPERIMENTS 



The experiments were carried out during the summer of 191 2 

 at the Puget Sound Marine Station, Friday Harbor, Washing- 

 ton. 6 Seven genera of the Majidae are found in the waters 

 of Puget Sound: Hyas, Epialtus, Chorilia, Chionoecetes, Scyra, 

 Pugettia and Oregonia. All seven forms (with the possible 

 exception of Chionoecetes) show some tendency towards pro- 

 tective concealment, although the instinct is most marked in 

 Oregonia gracilis which locally is known as the decorator crab. 



6 A systematic study of the plants and animals found upon Oregonia gracilis 

 has been undertaken by Miss Evelyn Way under the supervision of Professor 

 Trevor Kincaid, Director of the Puget Sound Marine Station. With their per- 

 mission, the following incomplete list of plants and animals is here given to con- 

 vey to the reader some idea of the variety of material found upon this crab. 



