GEOLOGICAL SURVEY OF THE TERRITORIES. 471 



9. Pentremites suhconoideus. Meek.* 



10. Melonitcs A single, very tliick, hexa.iroiinl, 



iiiterHiiibiilacial plate, with outer 

 surface a little convex, and grau- 

 lar. 



12. Hemipromtes Very small or only about one-half 



inch in diameter, with a high 

 triangular area. 



13. Productus About half an inch in diameter, very 



gibbous ; beak narrow, strongly 

 incurved; surface smooth, or 

 api)arently so. 



14. Productus Like P. hiserialh., Hall. 



15. Productus semireticulatus, Mar- 



tin, (species) Large and well developed. 



16. Productus lonr/isjnnus, Sowerby.Of usual size. 



17. Bhynchonella macra, Hall(?) 



18. HhyncJionella, mutata, Hall (?) 



19. Athyris Small, and like Atli. hirsuta, Hall. 



20. Eetzia Vcrmcuiliana, Hall 



21. iSjnrifer Very small, like a miniature S. opi- 



mus, H. 



22. Spiriferina Like S. spinosa {Sxnrifera spinosa, 



H.,) but smaller, and apparently 

 without spine-bases. 



23. Terehratula turgida, Hall. 



24. Nucula ShumardU, Hall. 



25. Macrodon (I) 



26. Cypricardin a 1 ndianensls, ( Cypri- 



cardcUa Indianensis, Hall.) 



27. Cypricardella plicata,\i'A\\{l) 



28. CypricardellasuhcUiptica.1 Hall (I) 



29. Nuculana nasuta {Nucula nasuta, 



Hair?) 



30. Conocardium 3IeeManum, Hall (!) 



31. Platyccras One or pore small species. 



32. Euomplialus Spurgencnsis^ Hall. 



33. Naticopsis ! . . . Like Naficopsis Carleyi {Natica 



Carleyi, Hall.) 



34. Bellerophon Two small, smooth species. 



35. Holopea Fragments of very small species. 



36. Pleurotomaria Very small. 



37. Cythere Very near G. carhonaria, Hall. 



38. Spirorhis aunutata, Hall. 



39. Phillipsia Fragments of small species. 



JUIiASSIC SPECIES. 



NEAR L0"\AT:R canon OF YELLOWSTONE RIVER. 



Names. Remarks. 



1. An Echinoid Mainly a cast of small species of an 



undetermined genus. 



* A very small, obconic species, much produced below the pseud-ambulacrul areas, 

 which are very fciliort. or almost confmed to the summit, as iu Codaatcr, though it is a 

 true Fentrcmite. 



