GEOLOGICAL SURVEY OF THE TERKITORIES. 477 



29. Kcritlna {Dostia (?) bellatulaj 



Meek, [a) 



30. Neritina {Dostia (?) cardei- 

 formis, Meek. {a) 



31. Uulima {1} inconspicua, Meek, {a) 



32. Eulima chrysalis, JMeek. [a) 



33. Eulima funimda, Meek, (a) 



34. Turriteila Coalvillensis, Meek, {a) 

 'So. Turriteila spironema, Meek. («) 



30. Turriteila {Aclis (?) micronema, ' 



Meek, (a) 



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



38. Anchura fusiform is, Meek, (b) 



39. Fusus{Neptunea) ^a&&i,Meek.(«) 



BEAR RIVER CITY, CRETACEOUS. 



Names. Remarks. 



1. Ostrea soleniscus, Meek Two thin layers almost composed 



of it. 



2. Inoceramns prohlematiciis , 



Scliloth (f ) Occurs iu great numbers. 



3. Inoceramns. 



4. Trapezium micronema, Meek. 



5. Corbicnla securis. Meek. 



0. Corbicula wquilateralis, Meek. 

 7. Cardium. 



FOSSILS OF THE BITTER CREEK COAL SERIES, WYOlNnNG. 



Names. Remarks. 



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



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



aud at a considerably liigher 

 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 {?) gryplio- 

 rhynchus. Smaller and smoother 

 than the last. 



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



* See descriptions in another part of this report. 



t This is constantly smaller, narrower, and usnallj'' thinner and deeper than O. 

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

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

 arcuate, along its entire length, almost like a Gri/jyhcca, 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 region, and have some- 

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

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

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

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

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

 be designated. 



