Haynes: Fauna of the Upper Devonian in Montana, 43 

 15. Leiorhynchus cf. laura (Billings). 



Cf. Leiorhynchus miiUicosta Hall, Pal. N. Y., IV, 1867, p. 358, PI. 56, figs. 26-40. 

 Cf. Leiorhynchus clarkei Prosser, Ohio Geol. Surv., 4th Ser. Bull. 15, 1913. 



Several specimens from the green shale and limestone member, 

 number 5, from Three Forks and Logan, are referred with some doubt 

 to this species. They are small flattened shells with three or four low, 

 rounded plications on each side of the sinus and fold, as well as in the 

 sinus and fold. They compare closely with L. miilticosta as figured 

 by Hall, but that is a Hamilton form, and these Montana specimens 

 are in a higher horizon. The Montana specimens are also similar to 

 L. clarkei Prosser, but are much smaller in size. 



Genus Camarotcechia Hall & Clarke. 



16. Camarotcechia contracta Hall. 



Rhynchonella {Stenocisma) contracta Hall, 1867, Pal. N. Y., IV., p. 351, Pl. 55, 



figs. 26-39. 

 Camarotcechia contracta? Kindle, U. S. G. S. Bull. 391, p. 22, PI. VI, figs. i-2a. 

 Camarotcechia contracta Raymond, Ann. Carnegie Mus., Vol. V, 1909, p. 141. 



Specimens apparently identical with those from Colorado and New 

 Mexico, which are identified as C. contracta, occur as one of the most 

 abundant forms in the green shale and limestone member number 5, 

 and also in smaller numbers in the overlying gray limestone, at all of 

 the localities where fossils were collected from the formation by the 

 writer. The specimens vary greatly in the number of plications in 

 the sinus and fold. The average number is three in the sinus and four 

 in the fold, but a considerable number of specimens have more or less. 

 The extreme numbers in the sinus are from two to five, and in the fold 

 from three to six. 



Family ATHYRID^ Phillips. 

 Genus Cleiothyridina Buckman. 



17. Cleiothyridina devonica Raymond. 

 Cleiothyridina devonica Raymond, Ann. Carnegie Museum, Vol. V, 1909, p. 143. 

 A very large number of specimens of this species were collected by 

 the writer in 1912 and 1913 from the gray limestone number 4, and 

 from the green shale and limestone member number 5, at all of the 

 localities. This species is described in detail by Dr. Raymond from 

 its occurrence at Three Forks and Logan. 



