Armstrongia Oryx 



thf f 1? '!''*"^'/'f '^■■^™g °f a oast of the original slab showing 

 n":nT' °' *'^ ^''^^'"^"- ^'^'^ °"^-' '^ P— <» - ' 

 Upper beds of the Chemung group, 9 miles south of Erie, Pa. 



Sclerothamnus Clausi (Marshall) 

 Fig. 2 Drawings of living specimen taken from the " Report on 

 the Hexactmelhda of the Challenger Expedition." 



146 



