478 GEOLOGICAL SURVEY OF THE TERRITORIES. 



5. Modiola Eock Spring and Black Butte, stri- 

 ated species. 

 C. Corhicula Bammieri, Meek* Black Butte Station. 



7. Corhictda ( Veloritina ) cytherifor- 



mis, M. «& H. (?) Point of Eocks and Black Butte. 



8. Corhicula {LeptestheH) fracta, 



Meek Hallville, just over coal-bed. 



9. Corhicula {Lept.) fracta, var. 



cra-ssiuscula* Black Butte, saurian bed. 



10. Corhicula {Leptesthes)crassatelli- 



formis, Meek Hallville, with C. fracta, in shale 



over a bed of coal. 



11. Corhnla crassateUiformis, Meekt .Black Butte Station, in saurian bed. 



12. Corhnla tropidophora, Meek* . . .Two miles below Point of Eocks. 



13. Corhula undifera, Meek* Eock Spring. 



14. Goniohasis insculpia, Meek* . . .Eock Spring and Point of Eocks. 



15. Melania {Goniohasis'^.) Wijomin- 



f/eusis* Black Butte saurian bed. 



16. Vivipara trochiformis, M. & 



H. (?) Black Butte saurian bed. 



TEETIAEY SPECIES. 



BEAR RIVER, ESTUARY BEDS. 



Names. Remarks. 



1. Uiiio priscus, M. & H. 



2. Unio helliplicatus, Meek. 



3. Corhicula [Veloritina) Durlicei, 



]\Ieek. 



4. Corhula jyyr if ormis, Meek. 



5. Corhula Enfielmanni, Meek. 

 C. Goniohasis chrysalifi. Meek. 



7. Viriparus Conradi, M. & H. 



8. Melantho [Campeloma) macros- 



pira, Meek. 



9. EhytopJcorus priscus, Meek. 



* See descriptions in another part of this report. 



t This shell seems to have exactly the form, and surface characters of Corhicula {?) 

 crai-satelhformis, found flattened between the laminre of the shale over one of the coal- 

 beds a,t Hallville, much lower in the series. It is decidedly thicker, however, and cer- 

 tainly has the hinge characters of Corhula. It is trne, I have not seen clearly the hinge 

 of the Hallville specimens, but so far as it can be made out it seems to give indications 

 of a different structure. Still, I suspect that good specimens from .each locality would 

 show that they are not only both Corbulas, but that they are specifically identical, 

 though it will be better to keep them separate for the present. 



