162 PALiEONTOLOGT OF NEW-YORK. 



Notwithstanding these differences of appearance in several fragments examined, it is im- 

 possible to find reliable characters for a separation of the species. Farther examinations may 

 discover specimens showing more decisive differences than those yet observed. 



Fig. 2 a. A fragment of the base with the point of attachment, showing the exterior surface of 



an expanded funnel-shaped frond. 

 Fig. 2 b. A portion of a similar frond, showing the external or striated surface. 

 Fig. 2 c. A smaller fragment, showing the root with a part of the frond, where the interstices 



are smaller than in the preceding. 

 Fig. 2 d. An enlargement of the striated surface, showing the asperate character of the striae. 

 Fig. 2 e, f. The celluliferous side of two fragments of this species. 

 Fig. 2 g, h. Enlargements from the two preceding fragments, showing the difference in form 



and arrangement of cells. 



Position and locality. In the shale at Lockport, associated vrith the preceding and with 

 Fexestella and Polypora. Small fragments occur on the surfaces of the calcareous layers in 

 the shale, and more rarely it is found in the lower part of the limestone above the shale. 



{Slate Collection.) 



