

Fig. C. 



Fig. 7. 



PLATE II. 



Isistius brasiliensis Q. G. Page 34. 



Fig. 1 . Outlines of the head as seen from above. 



Fig. 2. Outlines of the head as seen from below. 



Fig. 3. Skull as viewed from above. 



Fig. 4. Skull as it appears from the side. 



Fig. 5. Skull from the inside, in a vertical longitudinal section. 



Branchial cartilages of the right side, seen from below, showing the basihyal, ceratohyal, 



ceratobranchials and extra visce nils. 



Branchial cartilages of the right side, seen from above, showing the pharyngobranchials, 

 epibranchials and branchial rays. 



Fig. 8. Teeth from the upper jaw, four times life size. 

 Fig. 9. Teeth from the lower jaw, four times life size. 





