THE DEVONIAN FISHES OF MISSOURI 65 



writer found one of these teeth on the surface of the lower 

 layer of the Louisiana limestone, but Mr. Rowley insisted 

 that it must have come from the near lying shales that had 

 been disturbed while the street was being graded and said 

 that he had never seen one of the teeth in the Louisiana, though 

 he has collected from it for forty years. The green sandstone 

 that contains the teeth at Providence overlies the Devonian 

 with decided unconformity. It seems that the Phelps sand- 

 stone, the conglomerate and sandstone at Fulton, the green 

 sandstone at Providence and the red sandstones of Warren 

 and Montgomery Counties represent the first deposits in an 

 advancing sea and contain the fish teeth as part of the worked 

 over regolith. A Devonian shale was once present near Provi- 

 dence as is shown by a remnant of it described in another place 

 in this paper. 



CTENODIPTERINI 



Dipterus digitatus Eastman 

 (Plate IV, figure 21) 



1907. Palatal dental plate of undescribed dipterine species' 

 C.R. Eastman, Mem. N. Y. State Mus., 10, p. 202, pi. 4, 



fig. 8. 



1908. Dipterus digitatus Eastman, Devonian Fishes of Iowa, 

 la. Geol. Surv., XVIII, pp. 221-222, pi. VII, figs. 16-25. 

 One specimen of this species from near Providence, Mis- 

 souri, is in the collection of the University of Missouri. It 

 was collected from the green sandstone at the base of the Chou- 

 teau but was probably derived from the erosion of the Devo- 

 nian shales below. 



Conchodus variablis Eastman 

 (Plate III, fig. 8) 



1908. Conchodus variablis Eastman, Ann. Rept. Iowa Geol. 

 Surv., XVIII, pp. 230-231, plates IX and XL 

 One specimen of this species has been found in the shales 

 near Louisiana. The writer sent a photograph of the specimen 

 to Dr. Eastman, who identified it with his species. 



