TUE ■WOXDKKS OF THE SHORE. 99 



another (exquisite little creature) of a pearly 

 French white,* furred all over the back with 

 what seem arms, but are really gills, of ringed 

 white and gray and black. Put that yellow one 

 into water, and from his head, above the eyes, 

 arise two serrated horns, while from the after 

 part of his back springs a circular Prince-of- 

 "VTales's leather of gills, — they are almost exact- 

 ly like those which we saw just now in the wliite 

 Cucumaria. Yes ; here is another instance of 

 that same custom of repetition. The Cucumaria 

 is a low radiate animal, the sea-slug a far higher 

 raoUusk ; and every organ within him is formed 

 on a different type ; as indeed are those seeming- 

 ly identical gills, if you comp to examine them 

 under the microscope, having to oxygenate fluids 

 of a very different and more complicated kind ; 

 and, moreover, the Cucumorid's gills were put 

 round his mouth ; the Doris's feathers round the 

 other extremity ; that gray Eolis's, again, are 

 simple clubs, scattered over his whole back, and 

 in each of his nudibranch congeners these same 

 gills take some new luid fantastic form ; in Me- 

 libtra tliosc clubs arc covered with warts ; in 

 Sryllaa, Avith tufted bouquets ; in the beautiful 



• /Jb/»* jHijnUosa. 



