478 GEOLOGICAL SURVEY OF THE TERRITOElfiS. 



5. Modiola Eock Spring and Black Butte, stri- 



ated species. 



6. Gorbicula Bannisteri, Meek* Black Butte Station. 



7. Gorbicula ( Veloritina) ci/therifor- 



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



8. CorMcula {Le])testhes) fracta, 



Meek Hallville, just over coal-bed. 



9. Gorbicula (Lept.) fracta, var. 



crassiuscula* Black Butte, sauriau bed. 



10. Gorbicula {LeptestJies) crassatelli- 



formis, Meek Hallville, with G. fracta, in sbale 



over a bed of coal. 



11. Corbula crassatelliformis, Meekf .Black Butte Station, in saurian bed. 



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



13. Gorbula undifera, Meek* Eock Spring. 



14. Goniobasis insculpta, Meek* . . . Eock Spring and Point of Eocks. 



15. Melania (Goniobasis 1) Wnomin- 



(jensis* Black Butte saurian bed. 



16. Vivipara trocMformis, M. «fe 



H. (!) Black Butte sauriau bed. 



TEETIAEY SPECIES. 



BEAK EIVER, ESTUARY BEDS. 



Names. Remarks. 



1. TJnio priscus, M. & H. 



2. TJnio belUplicatus, Meek. 



3. Gorbicula [Veloritina) DurTieei, 



Meek. 



4. Goi'bula 2)yrifo7'mis, Meek. 



5. Gorbula Engelmanni, Meek. 



6. Goniobasis chrysalis, Meek. 



7. Viviparus Gonradi, M. & H. 



8. Melantlio {Gampeloma) macros- 



pira, Meek. 



9. Rhytopliorus priscus,M.e,Qk.. 



* Sec descriptions in another part of this report. 



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

 crassateUcformis, found flattened between the laminae of the shale over one of the coal- 

 hcds at Hallville, much lower in the series. It is decidedly thicker, however, and cer- 

 tainly has the hinge characters of Corlula. It is true, 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 difierent 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 keej) them separate for the present. 



