PLATE XIII. 



Fig. 30, Superior view of the cranium of Albula vul])es. From the same specimen of 

 •which the lateral view is shown in Fig. 29 of this paper. Life size from 

 nature by the author. 



Fig. 31. Inferior view of the cranium of Albula vulpcs. The elliptical area of teeth 

 are here seen upon the parasphenoid, /';•. S. Same specimen as in Fig. 30, 

 from Professor Gill's collection. Life size, from nature, by the author. 



Fig. 32. Inner aspect of opercular hones, hyoid, symplectic, and other elements of 

 Mioropteyus salmoides. Left side. Designed to show the relations of these 

 parts as found in a typical teleostean fish. Life size from nature ; drawn 

 by the author from his own dissections. 



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