SYSTEMATIC REVISION- 



SI 



INCERTAE SEDIS. 



EOSAURAVUS Williston.* 



Eosauravus copei Williston. 



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



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



lsodectes punctulatus Moody, Proc. Nat. Mus, vol. 37, 1 909, No. 1 696, p. 1 1 , 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 vertebra indicated, with perhaps one or two more. Kibs 

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

 intervertebral^. Vertebra? amphiccelous and doubtless notochordal. No indica- 



,<|j$# 



Fig. 8. — Outline of Eosauravus copei. After Moody. 



Fig. 9. — Outline of Sauravus costei. 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 



* This name was proposed by Dr. Williston in a letter to the author, dated December 18, 1909. 



