ADDITIONS AND CORRECTIONS. 



PHRAGMOCERAS 1 



Plate LXXYIII. Fig. 3 a, 6. 



The two individuals figured on Plate 78 were found near the junction of the Coralline 

 limestone, and the ash-colored rock above which is the continuation of the Onondaga- 

 salt group. The condition of the specimens in soft argillaceous shale is such as to leave 

 some doubt as to their true nature and relations. 



590. 1. STEPHANOCRINUS ANGULATUS. 



Eeference pag. 212, PI. xlviii, fig. 1 of this volume; also PI. Ixxxv, figs. 1, 2, 3 & 4. 



Since the description and figures of this fossil were completed, Col. Jewett of tockport 

 has shown me two individuals, preserving tentacula attached to the margin, along a 

 slight groove in the base of the depressions between the angular processes which orna- 

 ment the summit of the body. These tentacula or fingers consist of ten branches, each 

 composed of a double series of plates above, but uniting below in a series of coalescing 

 plates, which have a difierent arrangement. 



Fig. 1 is a lateral view of a specimen bearing tentacula, the base and summits of the 

 spines being broken off. 



Fig. 2 is a view of the summit of the same specimen enlarged, showing the tentacula 

 folded inwards between the spine-like processes, and nearly filling up the central space. 



Fig. 3 is a portion highly magnified, showing, as far as can be actually seen, the ar- 

 rangement of these tentacula and the plates at their base. There are doubtless inter- 

 mediate plates connecting the outer one on the right hand, and the two on the left hand, 

 with the others ; but they are partially or entirely removed, and the whole are so minute 

 as to render it impossible to present more than is here given. This discovery adds another 

 interesting and important feature to the characters of this peculiar fossil. 



Fig. 4 represents a restored form of this species, the characters represented being such 

 only as may be seen in the examination of numerous specimens in their imperfect con- 

 dition. 



The paper of M. Rcemer, illustrating this species, was only received more than a year 

 [Palaeontology — Vol. ii.] 45 



