234 EErORT UNITED STATES GEOLOGICAL SURVEY. 



examples of Inoceramus erect us Meek, which were obtained from No. 24 of 

 Mr. Meek's section, at the upper part of the fossiliferous series. It is 

 difficult if not impossible to say how it differs from 0. congesta Conrad; 

 and its identity with that species is still further suggested by the simi- 

 larity if not identity of I. ereetus with I. deform is Meek of the Colorado 

 Group, which is usually found to have lived commensally with 0. con- 

 gesta, as the Ostrea in question is seen to have done with I, ereetus. It 

 was for these reasons and for the want of access to types or illustrations 

 that I referred this Ostrea and its commensal Inoceramus to 0. congesta 

 and I. defer mis respectively, in Powell's Report on the Geology of the 

 Uinta Mountains, p. 99. 



4. Ostrea (Alectryonia) sannionis White. 



This well-characterized species has been found only at Coalville, and 

 only in the strata representing the space between Eos. 18 and 19 of Mr. 

 Meek's section. 



5. Gryphcca % 



Only a couple of imperfect examples of this species were found, but it 

 seems to be properly a Gryphea. If so, it is interesting as occurring at 

 a higher horizon than usual in the Cretaceous series of the West. It 

 occurs in Mo. 11 of Mr. Meek's section, with many other species. 



(>. Anomia ? 



Some fragments of an Anomia were found associated with the last- 

 named species, and Mr. Meek also mentions the occurrence of one in No. 

 17 of his section, where it is associated with brackish- and fresh- Water 

 forms, intermixed with some marine forms. 



7, 8, and 9. 



These three species of Pteria are from the second ridge represented in 

 Mr. Meek's section ; and, so far as I am aware, neither of them have been 

 found elsewhere. 



10. Inoceramus problcmaticus Schlotheim. 



Meek reports this species from No. 7 of his section, near the village. 

 I found the same at Old Bear River City, thirty-live miles to the north- 

 eastward, associated with species that occur in the second ridge at Coal- 

 ville, the strata of which are considerably higher in the series than those 

 from which Mr. Meek obtained his specimens. The former horizon is 

 certainly within the limits of the Fox Hills Group, while the latter pos- 

 sibly falls within those of the Colorado Group. 



11. Inoceramus ereetus Meek. 



It is this species that has already been referred to under the head of 

 No. 3, as differing but little from I. deformis. In the classification adopted 

 in Powell's Report on the Geology of the Uinta Mountains, I referred the 

 strata containing this species to the base of the Laramie Group (=Point 

 of Rocks Group of Professor Powell). At that time it was not uncom- 

 mon for different geologists to include some of the uppermost marine 

 Cretaceous strata in the Laramie Group. Now, however, I never inten- 

 tionally include any truly marine strata in that group. 



12. Inoceramus % 



See remarks under No. 29. 



13. Pinna ! 



Known only by fragments discovered by Mr. Meek. 



