626 NOTES ON THE PALEONTOLOGY OF LEWIS-GILMER COUNTIES. 



While about a dozen species are common to the Brush 

 Creek and Ames and do not occur below the Conemaugh, only 

 three species are common to and restricted jointly to the 

 Brush Creek and the Flint, showing the much closer relation- 

 ship between the Conemaugh faunas than between the hori- 

 zons below the Ames. However, about 10 species are com- 

 mon to the Conemaugh and the Flint, showing that the one 

 is either a descendant of the other or that they had a common 

 origin. 



Characteristic Conemaugh forms are : Chonetes verneuilanus, 

 Orbiculoidea missourictisis, Ambocoelia planiconn^exa, Derbya 

 crassa, Rhombopora lepidodendroidesf, besides rare mollusca. 



Range and Distribution of Fossils of Lewis County. 

 Numerals refer to localities from which the fossils were col- 

 lected. (See Register of Localities following.) Abbrevia- 

 tions: "a", abundant; "aa", very abundant; "c", common; 

 "x", the species is either rare or its relative abundance is not 

 known. 



Enchostoma elkensis 



Enchostoma sp. (new) 



Enchostoma ? sp. (rootlet ?) 

 Spirorbis pusillus, Loc. 89. 



Spirorbis ? sp 



Verities indet. (trails ?) . . . 

 Crinoidea (plates and stems) 



Rhombopora lepidodendroi- 



des ? 



Lingula umbonata 



Orbiculoidea missouriensis. 



Urbiculoidea capuliformis. . 



Derbya crassa 



Derbya robusta 



Chonetes granulifer 



Chonetes variolatus 



(cf. granulifer) 



Chonetes verneuilanus 



Productus semireticulatus. . 



Productus cora 



Productus pertenuis 



Pustula nebraskensis 



Pustula symmetrica 



Spirifer boonensis ? 



Ambocoelia planiconvexa. . 



Composita subtilita 



Composita sp 



Solenomya radiata'. '. . . '. '. ' ' 



Solenomya ? anodontoides 



Prothyris elegans 



Solenopsis solenoides ' 



103 104 1(V6 



