(Geological survey of the territories. 477 



29. Keritina {Dostia (f) hellatula, 



Meek. («) 



30. Neritina {Dostia (f) cardei- 

 formis, Meek. (a) 



31. Eulima (?) inconspicua^ Meek, (o) 



32. Eulima chrysalis, Meek. («) 



33. Eulima funicula, Meek, (a) 



34. Turritetla Coalinllensis, Meek, (a) 



35. Turritella spironema, Meek, (a) 



36. Turritella {Aclis (!) micronema, 



Meek, {a) 



37. Admete {1) rJiomhoidea, Meek, (a) 



38. Anchurafusiformis, Meek. (&) 



39. Fusus (Neptimea) GaJ)hi,Meek.{a) 



BEAR EIVEE CITY, CRETACEOUS. " 

 Names. Remarks. 



1. Ostrea sol€7iisciis J Meek Two thin layers almost composed 



of it. 



2. Inoceramus jjrohl.ematicus, 



Schloth (?) Occurs iu great numbers. 



3. Inoceramus. 



4. Trapezium onicronema, Meek. 



5. Corhicida securis. Meek. 



6. CorMcula ceqidlateralis, Meek. 



7. Cardium. 



FOSSILS OF THE BITTER CREEK COAL SERIES, WYOSONG. 



Names. Remarks. 



1. Ostrea Wyomingensis, Meek* . ..Point of Eocks. 



2. Ostrea arcuatiUs, Meekf About two miles north of Hallville, 



and at a considerably higher 

 horizon ; also at -Black Butte, still 

 higher, and three or four miles 

 farther eastward. 



3. Ostrea Two miles below Point of Eocks, 



associated with Anomia [f) gryplio- 

 rhynchus. Smaller and smoother 

 than the last. 



4. Anomia gryphorJiynchus, Meek* .Same as last. 



* See descriptions in another part of this report. 



t This is constantly smaller, narrower, and usually thinner and deeper than 0. 

 JTijomingeiisis, and never has its lateral margins, toward the beaks, dilated and hori- 

 zontally flattened, as iu that species. It also differs in being sometimes curved up, or 

 arcuate, along its entire length, almost like a Gryplicea, though it is often straight 

 without any curvature of the beaks. Its surface only shows rather obscure marks of 

 growth. It is a form I have long been familiar with from this regiou, and have some- 

 times referred to as resembling O. glabra, M. & H., of the Upper Missouri. A compari- 

 son of the better specimens found last summer, with L>. glabra, shows it to be quite 

 different, in being much more attenuate at the beaks, aud in having a larger and 

 longer ligament area. I am aware that the establishment of* species in the genus 

 Ostrea is unsatisfactory, but it seems desirable to have a name by which this form can 

 be designated. 



