Cord. 



152 



Cordaites robbii. Dawson. 



V/ll 



Geological History of Plants, 



ed. 1888, 

 page 81, 

 fig. 30; a 

 a group 

 of young 

 leaves; b 

 point and 

 G base of 

 a leaf; d 

 the vena- 

 tion mag- 

 nified. — 

 Erian or 

 D e V o n - 

 i a n ) of 



New 

 Br u n s- 

 wic k. 

 VIIL 



Cornulites arcuatus. Hall Geological Report on the 

 V-li. ^-^^.^^^ Fourth District N. Y. 1843, page 109, fig. 



39-3. Niagara formation. (Conrad, 

 Journ. Acad. Nat. Sci. Phila. Vol. viii, 

 1848. Plate 17, fig. 8.) Compare Tenta- 

 culites. It is composed of a series of cup- 

 like discs, inserted one within another at 

 their margins; rounder than those of the 

 English Wenlock fossil Cornulites serpularius (Sil. Research, p. 

 627, pi. 26, f. 5) and is easily distinguished from any other fossil 

 of the Silurian system. Occurs as isolated specimens in the 

 Rochester limestone ; in groups of specimens at Lockport, in 

 cavities partly filled with spar. Usually nearly destroyed; in- 

 vested with crystals ; sometimes only the central tube remains 

 (Hall).— F 5. 



