BRITISH SEA-SLUGS {NudibrancAs) 

 (After Alder and Hancock.) Drawn to various scales 



These beautiful little creeping Molluscs are devoid of shells, nor 

 do they possess the typical gill-chamber with gills characteristic of 

 their allies the Sea-Snails. Some, however, are provided with a 

 circlet of feather-like breathing-organs surrounding the intestinal 

 aperture (see i, 2, 4). Together with (see i and 2), or in the 

 absence of these (see 3 and 5), there may be a varying number of 

 simple or branching outgrowths (cerata) from the upper side of the 

 body, which are provided with defensive stinging-organs. 



Nudibranchs are either coloured so as to harmonize with their 

 surroundings (" general protective coloration "), or in such a way 

 ^as to make them very conspicuous (" warning coloration "). The 

 latter state of things advertises unpleasant properties by way of 

 smell or taste, and gives a certain amount of protection against 

 fishes, &c. 



1. Triopa claviger. 



2. Thecacera pennigera. 



3. Eolis coronata. 



4. Doris coccinea. 



5. Doto coronata. 



