234 INDEX. 



PLATES. 

 Rhynchonella Continued. 



saft'ordi, var. depressa 33 



Strickland! 29, 27 



tenuistriata 17 



tethys - 13, 31 



Rhynchotreta 



cuneata, var. americana 32 



Spirifera 



acuminata 8 



arctisegmenta '. . . 12 



atwaterana 9 



byrnesi 10 



conradana .... 7 



crispa, var. simplex 17 



davisi 12 



divaricata 11, 12 



dubia _ 33 



duodenaria 12 



euruteines 6 



euruteines, var. f ornacula 6 



foggi 32 



gregaria 8, 10 



grieri 9 



hobbsi ... 10 



knappiana 7 



macconathii . _ 11 



marionensis 



medialis 26 



mucronata 31 



oweni ._ 7 



radiata 29 



raricosta 17 



rostellum 27, 29 



sculptilis 31 



segmenta . . . 13 



varicosa , 10 



Streptorhynchus 



arctostriata 31 



subplanus 29 



tenuis . 



