SCYLL^A. 



Fig. 3. Interior of the buccal mass, exposed from above : — a, channel of the mouth ; b, b, cutting 

 edges of the corneous jaw ; c, c, portions of the jaw exhibited on the surface ; d, oesophagus; 

 e, tongue covered with rows of spines. 



4. External view of one of the corneous jaws : — a, cutting edge. 



5. The stomach laid open with two of the liver masses attached : — a, interior of the stomach ; b, 



belt of horny plates lining the same ; c } oesophagus ; d, intestine ; e, e, liver balls, showing 

 the tubes branching over their surface; f,f, ducts leading from the liver balls to the stomach; 

 g, g, two of the canals resulting from the union of the tubes that branch over the liver masses 

 and go to the skin. 



6. Two of the horny plates from the belt lining the stomach. 



7. One of the liver balls bisected longitudinally, exhibiting the internal structure : — a, central 



duct leading to the stomach ; b, minute ramifications of the same leading to c, the tubes 

 composing the inner layer ; d, outer layer of small canaliculated tubes. 



