SYSTEMATIC REVISION 



31 



INCERTAE SEDIS. 



EOSAURAVUS Williston.* 



Eosauravus copei Williston. 



Isodtcies punctulatus Cope, Proc. Am. Phil. Soc., vol. xxxvi, p. 88. 



Isodectes copei Williston, Journ. Geol., vol. xvi, 1908, p. 395. 



Isodectts punctulatus Moody, Proc. Nat. Mus., vol. 37, 1909, No. 1696, p. II, pis. 4 and 5. 



Type: The plesiotype of Isodectes punctulatus. The posterior portion of a 

 small skeleton. No. 4457 U. S. Nat. Mus. From Linton, Jefferson County, Ohio. 



Description abstracted from Williston's account of this specimen in the "Jour- 

 nal of Geology," 1908. 



Twenty-three dorsal vertebrae indicated, with perhaps one or two more. Ribs 

 small, slender and curved, moderately dilated at the proximal extremity; all attached 

 intervertebrally. Vertebrae amphicoelous and doubtless notochordal. No indica- 



Fio. 8. — Outline of Etuuravii ctptl. After Moody. 



Fio. 9. — Outline of Sauravui coslti. After Thevinin. 



tions of a ventral armor. No intercentra preserved, but these are doubtless present. 

 Two sacrals. Tail long and slender. Tarsus as in accompanying figure; phalanges 

 2, 3, 4, 5, 4. Terminal phalanges with claws. 



To the description given above should be added that the neural arches are low 

 and broad with horizontal zygapophysial faces and short, heavy spines. The 



* Thit name was propowd by Dr. Williaton in a letter to the author, dated December 18, 1909. 



