Raymond : Fauna ok Upper Devonian of Montana. 143 



worthy only for the small size of the specimens, which show all the 

 characters of the adult. 



Locality. — Logan, Three Forks, and elsewhere in Western Montana. 



Spirifer pinonensis Meek. 



(Plate III, figures ii, 12.) 



Spirifer {^Trigonotreta) pinonensis Meek, 1870. '■'■Proceedings Academy Natural 

 Sciences of Philadelphia,^'' p. 60. 



Spirifer pinonensis Walcott, 18S4. "Monograph U. S. Geological Survey,^'' No. 

 VIII, p. 138, PI. 4, figs I, \a-\e. 



A single well preserved specimen was found in the red fissile shale 

 at Three Forks. The shell is robust, both valves being strongly con- 

 vex. There are nine plications on each side of the fold and sinus, the 

 first one on either side being stronger than the others. The fold 

 shows a faint longitudinal indentation, and there is a trace of a plica- 

 tion in the sinus. The surface is marked by numerous fine concentric 

 lines of growth. 



Locality. — A very rare species in the red fissile shale of the Upper 

 Devonian at Three Forks, Montana. It occurs more commonly in the 

 limestone of the same region. 



According to Walcott, this species ranges from the base to the sum- 

 mit of the Devonian limestone throughout the Eureka District in 



Nevada. 



Genus Amboco-xia Hall. 



Ambocoelia gregaria Hall. 



(Plate III, figures 13-15.) 



Ainboccelia gregaria Hall, i860. " Thirteenth Annual Report New York State 

 Cabinet Natural History,'''' p. 81. 



Specimens of this species are fairly common and differ from the 



specimens found in New York only in their smaller size. 



Locality. — Found in the Three Forks shale at Logan and Three 



Forks, Montana. 



Family ATHYRID^ PhilHps. 



Genus Cleiothyridina Buckman. 



Cleiothyridina devonica sp. nov. 



(Plate III, figures 16, 17 ; Plate IV, figures i-ii.) 



Mr. Buckman has recently shown that the name Cleiothyris cannot 



be used for the group of shells usually so designated, as it was not so 



used by Phillips, the author of the genus. Mr. Buckman has there- 



