4G4 GEOLOGICAL SURVEY OF THE TERRITORIES. 



12. Conocoryphe Undetermined fragments. 



13. Bathyurus (f) Ilaydenii, Meek. . .Described in tliis report. 



14. Bathyurus serratus, Meek Described in this report. 



Fourth or loivest division. 



15. Gruziana * 



IG. Lingula, or Lingulepis Imperfect specimens. 



17. Conocoryphe Fragments. 



^18. Bathyurus^ or Asaphus. Fragments. 



FLAT-HEAD PASS, MONTANA. 



Names. Roiuarks. 



1. Bathyurcllus {Dikelocephalus'^.) 



trwicatns, Meek Described in tliis report. 



Bathyurelhis, [Asap^hiscus I) Described in this report. 





NEAR MALADE CITY, NORTHERN UTAH. 



Names. Remarks. 



1. Camerella Calcifcra, Billings.t 



2. Orthis hipp>olite, Bil\iugs.{^.)'^ 



3. Orthis Very finely striated and like 0. 



electra, Billings. 



4. Orthis A' larger and more comi)ressed spe- 



cies. 



5. Euomphalus{'^i)trochisc7(s,'MeQli.^. 



6. Euomphalus (i) rotuli/ormiSj 



Meek. 



7. Euomphalus ^ov Ophileta. 



8. Agnostus Josepha, Hall {'^.).\\ 



9. Conocoryphe = Fragments of perhaps several spe- 



cies. 



10. Bathyurelhis (Asaphiscus) Brad- 



leyi, Meek Described in this report. 



11. Bathyurus Saffordi, Billings.. .Only the pygidium, but agrees ex- 



actly with Canadian specimens 

 sent by Mr. Billings. 



*Tl\e name Gruziana, d'Orbigny, 1842, (Voy. (lans I'Amer. Merid., t. 3, part 2d, p. 30,) 

 having priority over Uusoplujcus, (JRyssojihycus,) Hall, 1852, will have to be retained for 

 these curious fossils. 



t The specimens are all separate valves, more or less broken, or p.artly hidden in the 

 matrix ; but so far as can be seen they certainly agree well in size and all external 

 characters with Mr. Billings' species, with possibly the exception of having a some- 

 what wider and deoi^er mesial sinus and more prominent mesial fold. 



t Agrees pretty nearly with the Canadian shell, though its mesial sinus is somewhat 

 wider and deeper. It may be distinct, but the specimens arc too imiierfect for satisfac- 

 tory comparison. 



§ These have been described in the Proceedings of the Academy Natural Sciences, 

 Philadelphia, Ap., 1870, p. 61, and will be figured in Mr. King's report. 



11 The specimens of this little trilobite seem to agree closely wnth Professor Hall's 

 species, excepting in some of the minute and api^arcntly variable details of the mesial 

 lobe of the head and pygidium. So far as I have been able to see, however, it would 

 also seem not to have the posterior lateial angles of the cheeks armed with little pro- 

 jecting points, as in the Wisconsin species. If these little spines do not exist in our 

 specimens, (none of which are in a condition to remove all doubts on this point,) they 

 would almost certainly belong to a distinct siiecies, in which c;isu I would propose for 

 the name Agnostus Maladensis. 



