466 GEOLOGICAL SURVEY OF THE TERRITORIES. 



lA. Sinrifer With hiDge-line much extended, and 



smaller and more numerous costoe 

 then the last, being much like ;S'. 

 hijMcatus, Hall, from the horizon 

 of the Waverley Group, Ohio. 

 - 15. Spirifer Mysticensis^ Meek.* 



16. Betzia. 



CANON, EAST SIDE OF MADISON RIVER, MONTANA. 

 Names. Remarks. 



1. Platycrinites Detached base. 



2. Poteriocrinites. 



3. Hemipronites crenistria, Phillips . Some finely striated varities found 



at Mystic Lake. 



4. Stro])1iomena (uialoga, Phillips. 



5 . Produbtus semireticulatuSj Martin . 



6. Productus longispi7ii(s, Sowerby (?) Same as No. 8 of list from Mystic 



Lake. 



7. Productus scahriculus,MaTtm{^.) .Same as No. 9 of list from Mystic 



Lake. 



8. Chonetes Same as No. 7 of list from Mystic 



Lake. 



9. Kliynchonella Same as No. 10 of list from Mystic 



Lake. 



10. Refsia, (fragments) 



11 . Spirifer Same as No. 13 of list from Mystic 



Lake. 



12. Spirifer Mysticensis, Meek. 



13. Spirifer [Martinia). 



14. Terebratula, (fragments) 



15. Platyceras An arcuate conical species. 



10. Euo7nphalus, (fragments of large 



species.) 



17. Pleurotomaria. (?) 



BRIDGER PEAK, NEAR FORT ELLIS, MONTANA. 



Names. Remarks. 



1. Lithostrfftion A compound species with small cor- 



allites. 



2. Remipronites crenistria^ Phillips (?)Same variety as No. 6, Mystic Lake 



list. 



3. Hemipronites A much more finely striated species. 



4. Productus lo7igispinus, Sowerby (?) . Same as No. 8, Mystic Lake, and G, 



CaGon, east side Madison Eiver. 



CAMP NO. 19, AUGUST 2, 1872, IDAHO TERRITORY. 

 Names. Remarks. 



1. Lophoptliyllwn. 



2. Zaplirentis. 



* A medium sized, very transverse species, with mucronate lateral extremities, and 

 12 to 15 simple, radiating costse on each lateral slope of each vale ; mesial sinus mode, 

 extended to the beak, with one rib in its bottom, and rarely faint traces of another on 

 one or both sides of this toward the front ; cardinal area, of moderate feeight, well 

 defined, and more or less arched with the beak. Resembles S. iimesiaUs, Hall, (Iowa 

 Report,) in size and form, but wants the lamellose imbricating concentric strise seen 

 on that species. 



