234 EEPOET UNITED STATES GEOLOGICAL SUEVEY. 



examples of Inoccramus ercctus Meek, wliicli were obtained from IsTo. 24 of 

 Mr. Meclc's section, at the ui)per part of tlie fossiliferous series. It is 

 (liiiicult if not impossible to say liow it difi'ers from 0. congcsta Conrad ; 

 and its identity Avitb that species is still fui'tber snggested by the simi- 

 larity if not identity of I. erectus with I. deformis Meek of the Colorado 

 (xronp, vfhich is usuallj^ found to have lived commensally with 0. con- 

 gesta^ as the Ostrea in question is seen to have done with I. ercctus. It 

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

 that I referred this Ostrea and its commensal Inoccramus to 0. ebnfjesta 

 and I. deformis respectively, in Powell's Eeport on the Geology of the 

 Uinta Mountaius, j). 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 IS^os. 18 and 19 of Mr. 

 Meek's section. 



5. Gryplioia ? 



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

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

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

 occurs in l^o. 11 of Mr. Meek's section, v/ith many other species. 



C. 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 v/ith brackish- and fi-esh- water 

 forms, intermixed with some marine forms. 



7, 8, and 9. 



These three species of Fteria 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. Inoeeramus prohleonaticus Schlotheim. 



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

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

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

 Aalle, 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. Inoccramus erectus 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 Eeport on the Geology of the Uinta Mountains, I referred the 

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

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

 mon for different geologists to include some of the uppermost marine 

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

 tionally include any truly marine strata in that group. 



12. Inoeeramus ? 



See remarks under No. 29. 



13. Pinna ? 



Known only by fragments discovered by Mr. Meek. 



