486 CARBONIFEROrS FORMATIONS AND FAUNAS OF COLORADO. 



Page. 

 Fig. 17. CIhonetks Hn.EMiNcu 352 



A specimen ahowing tlic custoniary characters. 



Ventral valve. 



Near Grand River, C!olo.(?) (station 2324). 

 Flos. 18 .\Nn 18a. Chonetes flemingi 352 



Another specimen of slightly different shape. 



Fig. 18. Ventral view. 

 18a. Dorsal view. 



Near Grand River, Colo.{?) (station 2324). 

 Figs. 19 and 19a. Chonetes geinitzi anus 355 



One of the better preserved specimens belonging to this species. 



Fig. 19. Ventral view. 

 19a. Dorsal view. 



AVeber shale: Leadville district (station 2267). 

 Fig. 20. Chonetes mesolobus 357 



A specimen in which the lobation is moderately strong. 



Ventral view. 



Hermosa formation; Hermosa Creek, Durango quadrangle (station 2238). 

 Fig. 21. Chonetes mesolobus .357 



Another specimen, somewhat more alate than the preceding, and with the lobation less 

 strongly marked. 



Ventral view. 



Hermosa formation : Hermosa Creek, Durango quadrangle (station 2238). 

 Fig. 22. Chonetes mesolobus 357 



A large specimen in which the lobation is obsolescent. 



Ventral view. 



Hermosa formation; Hermosa Creek, Durango quadrangle (station 2238). 

 Fig. 23. Chonetes mesolobus 357 



An example in which the characteristic lobation is very faint. 



Ventral view. 



Hermosa formation: Hermosa Creek, Durango quadrangle (station 2238). 



