THE LOWER EMBAR OF WYOMING 645 



pronounced in two of the drawings of the Russian specimen, but 

 the third drawing of the same tooth places less emphasis on this 

 character. 



Campodus corrugatus has been reported from both the Upper 

 and the Lower Pennsylvanian, but the identifications are uncertain. 

 Those identified from the Lower Pennsylvanian are all from the 

 lateral series of teeth and those from the Upper are from the 

 median series. 



This species is not known to be present in the Embar, but is 

 listed here to show the relationship of Mississippi Valley strata, 

 of the same age as the Embar, with the Moscowian of Russia. 



Campodus sp. undet. (PL II, Figs. 21 and 21a) 

 A small tooth from the Embar may belong to Campodus vari- 

 abilis N. and W. It differs from the figured forms of the lateral 

 series in being narrower and having more numerous and more 

 regular ridges crossing the top, but C. variabilis is highly variable 

 in this respect. 



It is of interest to note that Campodus variabilis seems to occur 

 in the Moscowian at Gshel, Russia. Trautschold described as 

 Arpagodus rectangulus 1 a form that cannot be distinguished from 

 teeth of the lateral series as figured by St. John and Worthen. 2 



Cochliodont gen. and sp. not determined (PI. IV, Fig. 8) 

 Two fragments that seem to represent the outer ends of teeth 

 of a large cochliodont cannot be referred to any genus. They may 

 belong to a described genus, but are too fragmentary for reference. 

 The tooth thins and narrows toward the outer end, but does not 

 twist, as is the case with most cochliodonts. 



Janassa unguiformis St. J. and W. (PI. II, Figs. 1-4) 



1870. Peltodus unguiformis N. and W., Geol. Surv. III., IV, 362-63, PI. II, 



Figs. 7 and 7a. 

 1889. Janassa unguiformis Woodward, Catalogue of Fossil Fishes in the 



British Museum, Part I, p. 39. 



One specimen from the Embar appears to belong to this species, 

 and a specimen from the Upper Pennsylvanian of Missouri is also 



trautschold, Nouv. Mem. Soc. Imp. Natur. Moscou., Vol. XIV, PI. XVII, 

 Figs. i2a-d. 



3 St. John and Worthen, Pal. III., Vol. VI, PI. VIII, Figs. 1-22. 



