470 GEOLOGICAL SURVEY OF THE TERRITORIES. 



26. Spirifer Uneatus, Martin, (spe- 



cies.) 



27. Sjpirifer Like some forms of S. increbescens, 



Hall. 



28. Spirifer triradialis, Phillips (?)* 



29. Spiriferina octoplicata, Sow- 



erby May be the same as 8. Kentuckensis, 



Shum. 



30. Betzia vera, Hall (?) 



31. Tere&r«i«Za arcMtttoj Swallow (I). Almost certainly the same as T. 



hovidens, Morton. 



32. Terehratula A small species possibly identical 



with T. turgida, Hall. 



33. Astartella Newherryi, Meek (!) ..I can see no difference in the sin^^le 



specimen examined, from the Ohio 

 species. 



34. Cypricardina Has the external appearance of the 



genus. 



35. Platyceras. 



36. Pleurotomaria sphcerulata, Con- 



rad -. The specimen agrees well with de- 

 pressed varieties of Mr. Conrad's 

 species from the western coal- 

 measures. 



37. Uuomphalus Fragments of cast of a large species. 



38. Phillipsia Fragments. 



DIVIDE BETWEEN ROSS FORK AND LINCOLN VALLEY, MONTANA. 



Names. Remarks. 



1. ZapJirentis Stanshuryi, Hall (?) 



2. Gyathopliyllum subccespitosum, 



Meek.t 



3. Lopliopliyllum or Cyathaxonia . . . Perhaps more than one small spe- 



cies. 



4. Syringopora. 



5. Platycrinus Body only, of a very small globose 



species. 



6. Pentremites Bradleyi, Meek.| 



7. Pentremites Godoni, Defrance (?) 



8. Pentremites conoideiis, Hall. 



* A very abundant, gregarious little shell, closely resembling S. triradialis, var. sexra- 

 dialis, as illusti-ated by Mr. Davidson, excepting that the largest of hundreds of speci- 

 mens are less than one-fourth the size of well-developed individuals of that form. It 

 also differs in being constantly wider than long, instead of the reverse, and in having 

 the beak of its ventral valve always proportionally shorter ; while it shows a faint 

 snlcus along the mesial fold toward the front, and a corresponding very slight ridge in 

 the bottom of the sinus of the other valve. I think it probably a new species. If so, 

 it may be called S. agelains. 



1 1 have figured and described this species in Mr. King's unpublished report. Its 

 corallites are long, cylindrical, more or less flexuous, and loosely branching instead of 

 growing in compact, fasciculated, or asterform masses, as in C. ecespiiosum, Goldfuss. It 

 has a more developed, more transversely wrinkled, and less striated epitheca (when 

 not worn) than Goldfuss's species. 



X A small species like P. KonincMams, Hall, but shorter below, and having its pseud- 

 ambulacra more deeply excavated along the middle, with their pore pieces more 

 transverse. ' 



