^iTE.] LAKAMIE FOSSILS FROM BEAR RIVER VALLEY. 241 



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

 Bear Eiver. This coal-bearing series contains an entu^ely dilierent fauna 

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

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

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

 Laramie Group. The equivalent sti'ata in this neighborhood of the dark 

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

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

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

 of reference in the folloN\ing 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 

 moUuscan 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 Grouj). The following list is 

 intended to embrace aU the invertebrate fossils that have hitherto been 

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

 Southwestern Wyoming : 



LIST OF LARAjMIE FOSSILS FKOlil BEAR RIVER VALLEY, TTYOMING. 



1. Meiiibranipora'i 



2. Ostrea % 



3. Yolsella % 



4. TJnio vetustus Meek. 



5. Unio hellijylicatus Meek. 



6. Pisidmm saginatum White. 



7. Sphwrium ? 



8. Corbicula ( Veloritina) durJceei Meek. 



9. Corhula pyriformis Meek. 



10. Corhula Englemanni Meek. 



11. Rhytopliorus prisciis Meek. 



12. Rhytopliorus meeld White. 



13. Limncea {Lininophysa) nitidula Meek. 



14. Acella haldemani White. 



15. Planorhis 1 



16. Bulimis longiusculus Meek & Hay den. 



17. Bulinus subelongatus Meek & Hayden. 



18. Btdinus disjunctus White. 



19. Macrocyclis spatiosa Meek & Hayden? 



20. Helix evanstonensis White. 



21. Columna teres Meek & Hayden. 



22. JVeritina naticiformis White. 



23. Goniobasis arcta Meek. 



24. Goniobasis cleburni White. 



25. Goniobasis chrysallis Meek. 

 20. Goniobasis chrysaloidea White. 



27. Goniobasis endlichi White. 



28. Pyrgulifera humerosa Meek. 



29. Hydrobia recta White. 



16 GS 



