PLATE XIII. 



Fig. 1. — Enlargement of the posterior ganglia. 

 Fig. 2. — Enlargement of the cerebral ganglion. 

 Fig. 3. — Enlargement of the pedal ganglion. 

 Fig. 4. — The young of anodon taken from the gill. 



Fig. 5. — The labial palpi held open and at right angles to the body, showing 

 their inner surfaces. 

 1. p. Labial palpi. m. Mouth. 



Fig. 6. — One of the labial palpi. 



Fig. 7 — Two of the ridges on the labial palpi enlarged, showing Cilia. 

 Fig. 8.— Enlargement of interior of a palpus. 

 Fig. 9.— Enlargement of exterior of a palpus. 



