134 



NEW YORK STATE MUSEUM 



14 



Dalmanites, A series of cephala indicating stage* of development in the border to a condition 

 of complete crenulation. 



12 Dalmanites (Hausmannia) micrurus Green ; early Devonic, Helderbergian, N. Y. i3D.pleuroptyx, 

 Green ; early Devonic, Helderbergian, N. Y. 14 D. d o 1 b e 1 i , early Devonic, Grande Greve limestones. 15 D. anchiops. 

 Green var. a r m a t u s Hall ; early Devonic, Schoharie grit, N.Y. 16D. stemmatus Clarke ; early Devonic, Oriskany lime- 

 stone, N. Y. 17. D. d o 1 p h i Clarke. Here is a departure toward the Probolium condition with crenulated border [see p. 133, 

 fig. 11]; early Devonic, Oriskany limestone, N. Y. 18 D. (Odontocephalus) selenurus Conrad. Indentations 

 of the border deep, the denticulations flat, incisor shaped, in contact at the periphery but not coherent. Early Middle 

 Devonic, Onondaga limestone, N. Y. 19 D. (Corycephalus) regalis Hall; early Devonic, Schoharie grit, N. Y. 

 goD. dentatus, Barrett ; early Devonic, Oriskany limestone, N. Y. 



