PLATE 78. 
ig. we 340. 1. GLyprocRINUS DECADACTYLUS. - (Pag. 281.) 
1 a. A figure of a specimen, preserving a small portion of the column and the entire length of the fingers. 
1b, Fragments of columns, composed of alternating large and smaller discs with angular edges. 
1c. Section of the same. 
1 d. Section and figure of a similar fragment of a column enclosed in a coral. 
1 e. Fragment and section of a column where the discs are excavated on their upper side, and have plain 
rounded edges with a pentapetalous impression on the extremities. 
1 f. Fragment of similar character, having the upper edges of the plates fimbriated. 
1 g. Section of the same enlarged. ,. 1. Magnified portion, showing the fimbriated edges of the discs. 
1%. Separate plates or discs of a similar column, showing the variable character of the marginal crenulations, 
one specimen being marked by six prominent angles. 
1k. Two figures, showing the proportionate size of the larger and smaller discs in the columns, composed of 
plain alternating joints. 
1m. Fragment of a column, with the edges of the discs rounded and slightly nodulose : intermediate plates 
thin. 
1 o. Edges of the discs rounded and nodulose ; intermediate ones thin, nodulose. 
1 p. Edges of the discs rounded and smooth, the intermediate ones thin. 
lr. Edges of the discs flat and broad, the intermediate ones thin. 
1s. A fragment of slate with moniliform columns ; the intermediate plates often being scarcely distinct, while 
in others they are half as thick as the larger ones. 
1 ¢. Large fragments of columns in the compact slaty rocks of the Hudson-river group, with the discs thick, 
the intermediate ones being scarcely visible. 
1 u. A similar fragment of a column, with a section of the end, showing identity with the preceding figures. 
Big. 2. 129. 1. TENTACULITES FLEXUOSA. (Pag. 284.) 
2a. Fragment of stone with several specimens a, a, a, associated with corals, shells. etc. 
2b, A specimen enlarged, showing the longitudinal strie. 
