104 NUDIBRANCHIATA. 
edges in different genera; but the tongue is, I 
believe, in all most elaborately armed with spinous 
teeth, arranged in numerous rows. 
The mouth has large fleshy lips prolonged into 
an internal tube, within which is a muscular 
TONGUE-TEETH OF EOLIS. 
(Magnified.) 
inner lip, capable of being pushed forwards, and 
bringing with it the mouth and jaws when the 
animal is in the act of seizing its prey. The mouth 
contains two large horny jaws placed vertically, 
and armed with cutting edges. The tongue is 
shaped like a strap, and can be moved in different 
directions, or thrown forwards to assist the animal 
