Pia. 



ORISKANY FAUNA OF BECRAFT MOUNTAIN 115 



Spirifer saffbrdi Hall 



Page 48 



23, 24 Exteriors of pedicle-valves showing the fimbriate surface. 

 In fig. 23 the rows of these fimbriae are more num- 

 erous and closely crowded than in the other. x2 



25 A portion of the surface enlarged showing the character 



of the spine bases on the concentric growth lines. 

 xlO 



Spirifer murchisoni Castelnau 



Page 46 



26 An incomplete brachial valve 



27 A ventral valve of large size showing the fimbriate 



surface 



28 A specimen showing the brachial valve with the internal 



cast of the ventral muscular impressions 



29 An enlargement of the surface showing the concentric 



rows of short hollow spinules. xlO 



30 A similar enlargement in which only the bases of the 



spinules are shown. xlO 



