EXPLANATION OF PLATE VIII. 



Fig. 1. Braiii of Centetes ecaudatus represented In situ, and of niitural size, from 

 above. 

 C H, Cerebral hemispheres. 

 C Q, Corpora qnadrigemina. 

 C B, Cerebellum. 



Fig. 'Z. Brain of the same : lateral aspect. 

 Letters as iu Fig. 1. 



Fig. 3. Section through sknll of Centetes ecawlntas iu frontal region x 2. 

 F, frontal bone. 

 N, nasal or ossified mesethmoid (?) 



Fig. 4. A portion of the roof of the sknll in the frontal region. 

 F', frontal bone. 



N, nasal. The posterior part of the nasal, closely embraced by the frontals, 

 seems to be distinct from the anterior part. 



