24 



Explanation of Plate XL 



(Chemung Cephalopoda, Gastropoda, and Brachiopoda. ) 



Fig- 



84. Orthoceras sp. Common in both Chemung and Portage 



rocks. 



85. Loxonema terebra. Eastern Chemung. Locally common. 



86. Euomphalus hecale. Western New York. Chemung con- 



glomerates and associated rocks. — After Hall. 



87. Spirifer disjunctus. East and west Chemung. The most 



characteristic and abundant Chemung fossil. Opposite 

 valve similar except with medial fold in place of sinus. 



88. Spirifer disjunctus. Internal cast of same valve as repre- 



sented by fig. 87. 



89. Spirifer mesaco stalis. Same species a v s fig. 40. Showing 



extreme cardinal cuspidation. East Portage, east and 

 west Chemung. 



90. Camaroicechia contracta. East and west Chemung, Com- 



mon. Brachial valve. 



91. Same species as fig. 90; pedicle valve, deeply imbedded in 



rock. 



92. Camaroicechia orbicularis. Western Chemung. Rare. 

 93. 



94* '* duplicata. Both valves. Western Chemung. 



95* " allegania. Western N. Y. Sandstone just 



below Olean conglomerate. 



96. Tropidoleptus carinatus. East Portage and east Chemung. 



97. Athyris angelica, somewhat decorticated. Western Che- 



mung. Common. 



98. Athyris polita, internal cast. West Chemung. Rare- 



common. 



99. Athyris a?igelica } perfect, with very fine radiating striae. 



