4G6 GEOLOGICAL SURVEY OF THE TERRITORIES. 



1^. Si)irifer With hinge-line much extended, and 



smaller and more numerous costiB 

 tlien the last, being- much like S. 

 hiplicatus, Jlall, from the horizon 

 ot the Waverley Group, Ohio. 



15. Spirifer Mysticcnsis, Meek.* 



16. Hetzia. 



CANON, EAST SIDE OF MADISON RIVER, MONTANA. 



Names. Remarks. 



1. Platycrinites Detached base. 



2. Poteriocrinites. 



3. IIemi])ro7iitescrenistria,Fh\[\ii^s. Some finely striated varities found 



at Mystic Lake. 



4. Stropliomena analoga, Phillips. 



5. rroduetussemireficulatus, Martin. 



6. Froductus longispinus, Sowerby (?)Same as No. 8 of list from Mystic 



Lake. 



7. Froductus scahriculus, Martin (?) . Same as No. 9 of list from Mystic 



Lake. 



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



Lake. 



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



Lake. 



10. Fetzia, (fragments) 



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



Lake. 



12. Spirifer Mysticennis, Meek. 



13. Spirifer {Martinia). 



14. Terebratula, (fragments) 



15. Flatyceras An arcuate conical species. 



10. Umow^^/z^/Z^.s', (fragments of large 



species.) 



17. Fleurotoniaria. (I) 



BRIDGER PEAK, NEAR FORT ELLIS, MONTANA. 

 Names. Remarks; 



1. lAthoHtrotion A compound species with small cor- 



allites. 



2. Hemipronites crenistria., Phillips (!)Same variety as No. G, Mystic Lake 



list. 



3. Hemipronites A much more finely striated species. 



4. Froductus longispinus, Sowerby ('?).Same as No. 8, Mystic Lake, and G, 



Canon, east side Madison Eiver. 



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



Names. Remarks. 



1. Lophophyllnm. 



2. Zaphrentis. 



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

 12 to I.') simple, radiatini^ cost* on each lateral slope of each vale; mesial sinus mode, 

 extended to tlie 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 keight, well 

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

 Reisort,) in size and form, but wants the lamellose imbricating concentric striie seen 

 on that species. 



