212 ON THE MORPHOLOGY OF THE SKULL IN AMPHIBIA FRODELA. 



Fig. 3. Visceral arches of same, part of upper view, x 10 diam. 



4. Skull of adult Taricha torosa, upper view, x 10 diam 



5. The same, lower view, x 10 diam. 



6. Mandible of same, outer view, x 10 diam. 



7. The same, inucr view, x 10 diam. 



8. Hyobranchial arches of same species, x 4 diam. 



9. Visceral arches of larva of Spelerpes rubra, upper view, x 13 diam. 



Plate XX. 



Fig. 1. Skull of larva of Spelerpes rubra, 1 in. 10 lines long, upper view, x 15 diam. 



2. The same, lower view, x 15 diam. 



3. Skull of 1st larva of Spelerpes salmonea, 2 in. 1 line long, upper view, x 10 diam. 



4. The same, lower view, x 10 diam. 



5. Skull of 2nd larva of Spelerpes salmonea, 3f in. long, upper view, x 7£ diam. 

 G. The same, lower view, x 7h diam. 



7. Side view of part of same, x 7^ diam. 



8. Part of auditory capsule of same, showing inner face of stapes, x 22^ diam. 



9. Part of auditory capsule of Spelerpes rubra (larva), lower view. x 30 diam. 

 10. The same in 1st larva of Spelerpes salmonea. x 30 diam. 



Plate XXI. 



Fig. 1. Skull of adult Spelerpes rubra, upper view, x 5 diam. 



2. The same, lower view, x 5 diam. 



3. The same, side view, x 5 diam. 



4. Mandible of same, inner view, x 5 diam. 



5. Hyohranchial arches of the same, x 5 diam. 



G. Skull of adult Desmnynathusfuscus, upper view, x 6 diam. 



7. The same, lower view, x G diam. 



8. The same, side view, x 6 diam. 



9. Mandible of same, inner view, x G diam. 

 10. Hyobranchial of same, x 6 diam. 



