AND AVES OF NORTH AMERICA. 



245 



Synopsis of Specks with their Stratigraphical Positions — Continued. 



o 



o 

 g 



Hypsosaurus rogersi, Owen, 



Do. fraterculus, Cope, .... 



Rhabdopelix longispinis,* Cope, .. . . 



Palseoscincus oostatus, Leidy, 



J tadrosaurus foulkei, Leidy, 



J)o. mirabilis, Leidy, \ 



Do. ? occidentalis, Leidy,.. 



Do. minor, Marsh, 



Astrodon johnstoni, Leidy, 



Troodon formosus, Leidy, 



Megadaotylus polyzelus, Hitchcock, 



Batkygnathus borealis, Leidy, 



Clepsysaurus pennsylvauicus, Lea, . 

 Aublysodon horridns, Leidy, 



Lselaps aquilunguis, Cope, 



Do. macropus, Cope, 



Coelosaurus antiquus, Leidy, 



Ornithotarsus immanis, Cope, 



H 



«H 



O 







g 









P 







Ul 





P 





ffi 



o 







-X- 







■x- 



-x- 



-x- 



-x- 



•X- 



tt 



■x- 



-X- 







-x- 







-x- 



■X- 



-x- 



o 



►d 



o 



o 



hj 



80 



83 



172 



!)!) 



98 



98 



98 



122-J 



99 



120 



122- a 



119 



122-a 



120 



100 



118 



119 



120 



RECAPITULATION. 



Number of Species. 



BAT KA CI DA. 



Xenorhachia, 1 



Microsauria, 14 



Ganocephala, 3 



Labyrinthodontla, 4 



REPTILTA. 



Iohthyopterygia, 2 



Sauropterygia, 6 



Thecodontia, 4 



Testudinata, . . 

 Pythonomorph 



Ophidia 



Crocodilia, 



Dinosauria, 



42 

 22 



8 

 16 



1 

 15 

 11 



Total 



.140 



Distribution in Time. 



I5ATRACIIIA. 



Xenorhachia, 



Microsauria, 



Ganocephala, 



Labyrinthodontia, 



REPTILTA. 



Iohthyopterygia) 



Sauropterygia, 



Thecodontia, 



Pythonomovpha, 



Testudinata, 



Ophidia,, 



Crocodilia, 



' ( > . 



Dinosauria, 



AVES, 



This form Is quite as likely to prove Ethynchocephalian as Pterosaur 

 AMEKI. PHILOSO. SOC. — VOL. XIV. — G2 



o 



Q 



H 



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o 























C 



o 



s» 









Cfi 





a 



B CO 



5 



95 



5 



o 

 re 



o 



o 



1 



o 







5b 



99 



OS 











1 











18 



i 





















.v 









PI 



i 



4 



3 

 1 



8 



22 

 27 



11 







5 



4 



8 



a 



w 



o 



o 



tThe »uppose<] Juvasitc atroU of the Judltb Blrer may not belong to that period. 



