Sea-slugs 



297 



an inch long, pellucid white tinged with yellow, 

 except the dorsal tentacles, which are brown with 

 white tips. A little below the tips these tentacles 

 swell out and then contract again. The cerata are 

 arranged in five or six oblique rows; in some 

 specimens these have an olive band near the tip. 

 F. carneus, the other British species, has the body 

 and cerata of a pale rose or flesh colon i". 



The Crowned iEolis {Facelina coronata) is about 

 1 inch in length, transparent - white tinged with 

 rose, marked on the head, back, and the front of 

 tlie cerata with opalescent blue and opaque white. 

 The dorsal tentacles are fawn coloured adorned with 

 alternately complete and incomplete olfactory plates 

 — the '' crown " of its name. The cerata are grouped 

 in six or seven clusters or curved rows. This is one 

 of the most likely species to fall in the way of the 

 novice, and it is certainly not one of the least 

 beautiful. It occurs between tide - marks, feeding 

 upon the Beadlet Anemone, on Lucernaria, various 

 sponges, and its own kind. The colour of the cerata 

 tube varies with this 

 food, but ordinarily 

 it is some tint of 

 crimson. There are 

 three other species, 

 of which one, the 

 Dotted iEolis {F. 

 ininctata), is fig- 

 ured. The dark 

 flesh-tinted cerata 



are in six or seven large clusters, of which the lirst 

 and second are separated by a much greater interval 



"«|>-jW^^^*^s-« 



Dotted /Eolis 



