white.] LARAMIE FOSSILS FEOM BEAE EIVEE VALLEY. 241 



ward these Laramie strata are found exposed in the east valley-side of 

 Bear Eiver. This coal-bearing series contains an entirely different fauna 

 from that of the beds beneath ; but because of its apparent stratigraph- 

 ical conformity with them, and the fact that some of its fossils have 

 been identified with Laramie fossils elsewhere, I refer the whole to the 

 Laramie Group. The equivalent strata in this neighborhood of the dark 

 gray shales in the other, which contain the teliost fish-scales, are a little 

 greater in aggregate thickness, and a portion of them are composed of 

 thicker layers, but their identity is easily recognized. For convenience 

 of reference in the following remarks I shall designate these, together 

 with the coal-bearing series, as the "upper beds"; and those beneath 

 them, containing the brackish- water fossils, I shall, for the same purpose 

 of local reference and present discussion, use the term " lower beds." 

 Of invertebrate fossils only fresh-water and land shells have been found 

 in the upper beds, and these only at the Almy or Evanston-coal mines ; 

 but those of the lower strata embrace both brackish and fresh water 

 molluscan forms, the latter including a few palustral pulmonates. Among 

 those brackish and fresh water forms are two or three types which have 

 never been recognized except in these lower beds or their immediate 

 equivalents, and nearly their whole fauna is in marked contrast with 

 that of any other portion of the Laramie Group. The following list is 

 intended to embrace all the invertebrate fossils that have hitherto been 

 found in the Laramie strata of Bear Biver Valley within the limits of 

 Southwestern "Wyoming : 



LIST OF LAEAMTE FOSSILS FEOM BEAE EIVEE VALLEY, TTYOMING. 



1. Membranipora'i 



2. Ostrea ? 



3. Yolsella ! 



4. JJnio ■vetustus Meek. 



5. Unio belliplicatus Meek. 



6. Pisidium saginatum White. 



7. Sphcerium ? 



8. CorbicuJa (Yeloritina) durlceeiMeek. 



9. Gorbula pyriformis Meek. 



10. Corbula Englemanni Meek. 



11. Bhytophorus prisons Meek. 



12. Bhytophorus meeki White. 



13. Limncea {Limnophysa) nitidula Meek. 



14. Acella haldemani White. 



15. Planorbis^ ? 



16. Bulinus longiusculus Meek & Hay den. 



17. Bulinus subelongatus Meek & Hayden. 



18. Bulinus disjunctus White. 



19. Macrocyclis spatiosa Meek & Hayden? 



20. Helix evanstonensis White. 



21. Columna teres Meek & Hayden. 



22. N'eritina naticiformis White. 



23. Goniobasis arcta Meek. 



24. Goniobasis cleburni White. 



25. Goniobasis chrysallis Meek. 



26. Goniobasis chrysaloidea White. 



27. Goniobasis endlichi White. 



28. Pyrgulifera liumerosa Meek. 



29. Hydrobia recta White. 

 16 a S 



