PLATE II. 



Fig. 4. The skull of Amia calva vertically bisected through the median line ; same 



specimen ; life size. (After Sageraehl.) 

 Fig. 5. The same; lateral view of the cranium before bisection. (After Sagemehl.) 

 Fig. 6. Primoidal cranium of Amia calva; same specimen as before, viewed from 



above after the removal of all the " cover bones ; " life size. The cartilage 



tracts here are between the premasillaries (Pmx); ato?; all the central 



portion and the lateral fossae, ia. (After Sagemehl.) 

 Fig. 7. Superior view of the skull of Amia calva, with all the " cover bones " in situ. 



Life size. (After Franque.) The figures in this plate copied by Mr. H. L. 



Todd from the author's figures as given. 



98 844 



