HEEMIT AND CLOAKLET. 241 



ceeded in doing what I had never done before, domicili- 

 ating both Crab and Adamsia. Both continued in the 

 highest health, and became quite at home. 



After about three months, however, I noticed that 

 the Adamsia was not looking so well. One side or 

 wing had gradually loosed its hold of the shell-lip, so 

 that it hung loosely down beneath the breast of the 

 Crab. Yet in other respects the zoophyte seemed healthy. 

 Latterly, too, the Crab had manifested symptoms of 

 uncomfortable straitness, in the great extrusion of his 

 fore-parts ; so great, indeed, as to expose even the front 

 of the soft abdomen. Yet I felt reluctant to present to 

 the Crab a larger shell, fearing that he would, in availing 

 himself of it, desert his zoophyte friend, which would 

 then die, and I should lose the specimen. 



At length the desire to solve a problem in science 

 prevailed over this feeling. A fact is better than a 

 specimen. And so (on April 21st) I selected from my 

 cabinet a full-grown Natica shell, and placed it on the 

 tank-floor, not far from the disconsolate trio. 



The Pagurus presently found the new shell, and 

 immediately began to overhaul it. He did not do, 

 however, as his brother Bernhard would have done, at 

 once shift into the new house. Having turned it 

 mouth upward, he took hold of the outer and inner 

 lip, each with a claw, and began to drag it about the 

 Q 



