464 RICHARD SWANN LULL ON 



ICHNITES. 



A. Tetrapodiciixites. 

 1 . T. didactylus. 



B. Sauroidichnites. 



1. S. harrattii. 3. S. minitans. 



2. S. 2^(^(hn<xtus (formerly Ornithlchnites 4. S. polemarchius. 



palmatus) . b. S. tenuissimus. 



C. Ornithichnites. 

 a. Pachydactyli. 



1. O. giganteus. 4. 0. jxtraUehis {iormerly 0. fuberosus,veiv. 



2. O. tuberosus. dnbius) . 



3. 0. parindus. 5. O. divaricatus. 



6. O. cuneatus. 



b. Leptodactyli. 



1. O. iiigens. 6. 0. mininnis. 



2. 0. robustus {0. ingens muior) . 7. O. crassus. 



3. 0. dipersus, var. clams. 8. 0. mlnusculus. 



" " " platydaotyhiH. 9. 0. tetradactylus. 



4. O. deaiiii. 10. O. gracilis. 



5. 0. tenuis. 



Another classification was that published in 1844 (E. Hitchcock, '44a) embracing 

 foreign as well as American species. 



1. Tetrapodichnites; footprints of quadrupeds, containing among other forms, 

 Chirotherium, Batracholdichnites (BcUrachopus) deweyl. 



2. Dipodichnites ; footprints of bipeds. 

 A. In America. 



a. Sauroidichnites; resembling the tracks of sauriaus. 11 species. 

 1). Ornithoidichnites ; resembling the tracks of birds. 



1. Pachydactyli, with thick digits. 4 species. 



2. Pachydactylo-pterodactyli, with thick digits having thin edges. 2 species. 



3. Leptodactyli, with long and slender digits. 15 species. In all, 32 species. 



