Fossil Plants. 3l 
cunx ; grooves half an inch in width, two-eighths deep; disks nearly 
filling the width of the groove, a little raised, and depressed at one 
side ; distance equal to the diameter of the disks. 
bservations.—A most beautiful and perfect impression, about 
fifteen inches in length; the original trunk, of which this is only a 
segment, must have been more than a foot in diameter, and many 
feet in length. In fine grained sandstone, at Mariner’s. Mills, and 
named for that locality. I received also a beautiful cast of Cala- 
mites columnare, remarkable for the size and depth of the columns, 
from Dr. K., finely impressed in red sandstone, from a locality some 
miles north of this spot. (Fig 
Fig. 7. 
‘Half size. 
Ficorprres scasrosus. ‘Specific Character and Description— 
Cicatrices approximate ; arranged spirally ; spines small, stem cyl- 
indrical ; one inch and a half in diameter, up to four inches; length 
unknown. 
Observations.—When taken from the sandstone rock on the Maho- 
ning River, the surface was coated with bituminous matter. This fossil 
plant much resembles. some of the recent species of Cactus, and was 
probably of the same succulent growth, and coated with spines. I 
have several specimens of various sizes, from half an inch to four 
prc in diameter. a are all sandstone easts. Same locality. 
(Pig. 7.) 
