- 
New Species of Fossils from the Hudson River Group. 319 
posterior basal region. Surface smooth or marked by very fine con- 
centric lines; muscular impressions not known, 
Casts of this species occur in the Hudson River Group, on the hills, 
at Cincinnati, but the shell is extremely rare. The greater part of the 
shell is preserved in the specimen illustrated. It was found by W. J.' 
Patterson, Esq., of Cincinnati, to whose collection it belongs, and, so 
far as I know, with the exception of a specimen preserving part of 
- the shell in my own collection, no other specimen preserving any part 
of the shell has ever been found. The casts are very scarce and usu- 
ally very imperfect, so much so that after the examination of forty or 
fifty specimens I have been unable to detect any muscular impres- 
sions or scars whatever, 
ORTHOCERAS CINCINNATENSE (S. A. Miller). 
'(ORTHOCERAS CINCINNATENSE, S. A. Miller, 1875, Cin. Quar. Jour. 
See vol ii, p. 127). 
Plate VIIL., fig. 5, this specimen was used originally as atype; fig, 5a, thisis worn so as to 
make the chambers appear to be arched backward. 
This species is distinguished from O, byrnesi by the more distant 
septa, and more rapidly tapering shell. 
ORTHOCERAS HARPERI (8S. A. Miller). 
(ORTHOCERAS HARPERI, 8. A, Miller, 1875, Cin. Quar. Jour. Sci., vol. 
pak 8: )) - : 
Plate VIII., figs. 6 and 6a, both of these specimens are in the author’s collection, and 
were used as type specimens. 
This species is distinguished by the closeness of the septa, and the 
abrupt enlargement of the siphuncle in each chamber. 
OrtHoceras FrosTEert (8. A. Miller), Plate VIIL, figs. 7 and 7a. 
_ (ORntHoceRAS FostErRI, April, 1875,.Cin. Quar. Jour. Sci., vol. ii., 
eee.) 
(Syn.—Orthoceras duseri. Hall and Whitfield, Ohio Pal., vol. ii., p. 
97, pl. iii., figs. 2-4. ) 
Orthoceras duseri was published several months after the publication 
of Orthoceras foster’, and seems to be clearly a synonym, as it came 
from the same locality, and possesses nearly the same measurements. 
ORTHOCERAS BYRNESI (S. A. Miller). Plate VIII, fig. 8. 
(OrTHOCERAS BYRNESI, S. A. Miller, 1875, Cin, Quar. Jour. Sci., vol. 
is, p. 126.) 
This is the most abundant species found at the stone quarries on 
the hills in Cincinnati, 
