Prof. Hitchcock on Ichnolithology , or Fossil Footmarks. 317 



ment of the species. I include them all in the class Ichnolites, 

 or stony tracks ; and this class is subdivided into four orders, 

 founded on the number of feet in the animal that made them. 



wr 



Class Ichnolites. 

 I. Order Polypodichnites, or many-footed tracks. 



1. On the forest marble near Bath in England. 



2. On the slate of Hudson River. 



II. Order Tetrapodichnites, or four-footed tracks. 



1. Several species made by Chirotheria, or the Labyrinthodon 

 most probably, in Germany and England. 



2. By Saurians in England. ] 



3. By Tortoises in Scotland and Germany. I 10 or 12 spe- 



4. Other Batrachians besides the Labyrinthodon [ cies in all. 



in Germany. 



Massachusetts 



Deweyi 



III. Order Dipodichnites, or two-footed tracks. 

 (!•) In Massachusetts, Connecticut, and New Jersey. 



a * Sub-Order Sauroidichnites, or tracks resembling those of Sau~ 



nans. 



*• S. Barrattii. 7. S. minitans. 



2. S. heteroclitus. 8. S. longipes. 



* S. Jacksonii. 9. S. tenuissimus. 



4- S. Emmonsii. 10. S. palmatus. 



5- S. BaiJeyi. 11. S. polemarchius 



6 - S. abnormis. 



b. Sub-Order Omithoidichnites. 



I. Pachydactyli. 



*• O. giganteus. 3. O. expansus. 



2 - O. Siilimani. 4. O. gracillimus, 



2. Pachydactylo-Pterodactyli. 

 !• O. Lyelli. % O. fulicoides. 



y ol- xi-vu, No. 2.— July-Sept. 1844. 41 





