io6 



THE PERMO-CARBONIFEROUS RED BEDS OF 



dragging them from cavities, as suggested by Williston. The powerful 

 crushing-teeth of Diadectes and Pantylus would have made nothing of the 

 shells of the nautiloids and other molluscs. 



Dr. White "^ has given the following list of invertebrates from the Clear 

 Fork limestone : 



Table 2. — List of Invertebrate Species from the Texan Permian. 



3- 

 4- 

 5- 

 6. 



7. 

 8. 



9- 

 10. 

 II. 

 12. 



T3- 



14. 



15- 

 16. 



17 

 18, 

 19, 

 20, 

 21, 

 22, 



23. 

 24. 



25. 

 26, 

 27. 

 28. 

 29. 

 30. 

 31- 

 32. 



Goniatites baylorensis, n. s 



Waagenoceras cumminsi White 



Medlicottia copei W 



Popanoceras walcotti W 



Orthoceras rushensis McChesney?. . . 

 Nautilus winslowi Meeli & Worthen . 



N. occidentalis Swallow 



N. ? 



N. ? 



N. ? 



N, 



(Endolobus) 



Naticopsis remex W 



N. shumardi McChesney? 



Euomphalus subquadratus Meek & Worthen . 



E. ? 



Murchisonia ? 



. Patella ? 



Bellerophon crassus Meek & Worthen . 

 B. montfortianus Norwood & Patten. , 

 B. ? 



Sedgwickia topekaensis Shumard sp. 

 Pleurophorus ? 



Clidophorus occidentalis Geinitz . . . . 

 Yoldia? subscitula Meek & Hayden. 



Myalina permiana Swallow 



M. aviculoides Meek & Hayden 



M. perattenuata Meek & Hayden. . . 



Gervillia longa Geinitz 



Aviculopecten occidentalis Shumard. 



Syringopora ? 



Spirorbis ? 



Cythere nebrascensis Geinitz. 



Camp 

 Creek. 



X 

 X 



Godwin 

 Creek. 



X 



X 

 X 



X 

 X 

 X 

 X 



X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 



X 



Military 

 Crossing. 



X 

 X 

 X 

 X 

 X 

 X 

 X 

 X 



X 

 X 

 X 



X 

 X 

 X 



X 



X 



X 

 X 



X 



X 



X 



SUMMARY. 



MoUusca Cephalopoda ."^7i 



Gasteropoda g 



Conchif era o 



Articulata Vermes . . . . i 



Crustacea i 



Radiata Polypi i 



Total 32 



TERRESTRIAL AND AQUATIC ADAPTATIONS. 



As has been remarked above, the Permo-Carboniferous fauna, with the 

 possible exception of Cricotus and Chenoprosopus, contain no amphibians or 

 reptiles which have advanced adaptations to an active aquatic life; there 

 are no other forms which approach the proportions and form of the body, 

 limbs, or skull found in forms which spend the major portion of their time 

 in the water seeking a swiftly moving prey. Undoubtedly many of the 

 amphibians and reptiles were accustomed to remain in or near the water, 

 lurking in pools or swamps. The position of the eyes and nostrils, near the 



" I. C. White, Bull. U. S. Geological Survey No. 77, p. 16, 1891. 





