The Hvoid Bonf. in Mastodon Amkricanus. 



467 



F'lc. 5- Posterior view of hyoid bone of Mastodon Atitericaniis Kerr. BH, basi- 

 hyal bone ; TH, thyrohyals. (J^ nat. size.) 



and at a time geologically not far remote the woodlands of North 

 America again and again resounded to the shrill trumpetings of the 

 mighty beasts. 



