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ALUS. 



[Vol. XVI II. 



EXPLANATION OF PLATE V. 



Fig. II. Lateral view of the brain case, showing the surfaces of inser- 

 tion of the muscles. X 2. 



Fig. 12, a. External view of the rostrale. X 2. 



Fig. 12, b. Internal view of the same. X 2. 



Fig. 13. Lateral view of the squamosal bone. X 2. 



Fig. 14. External view of the maxillary. X 2. 



Fig. 15. Internal view of the maxillary. X 2. 



Fig. 16. External view of the premaxillary. X 2. 



Fig. 17. Internal view of the premaxillary. X 2. 



Fig. 18. Internal, or dorsal view of the parasphenoid. X 2. 



Fig. 19. Internal, or dorsal view of the vomer. X 2. 



Fig. 20. Internal, or ventral view of the frontal. X 2. 



Fig. 21. External view of the petrosal. X 2. 



Fig. 22. Internal view of the petrosal. X 2. 



Fig. 23. Dorsal view of the occipitale laterale. X 2. 



Fig. 24. Dorsal view of the basioccipital. X 2. 



Fig. 25. Ventral view of the basioccipital. X 2. 



Fig. 26. Lateral view of the first three vertebrae. X 2, 



Fig. 2y. Lateral view of the supraclavicular. X 2. 



Fig. 28. Three scales of the lateral line. X 4. 



