1870.] 
253 
[Winch ell. 
specimen, which may be a dorsal valve distorted by pressure exerted at 
the hinge extremities. If undistorted, it belongs, evidently, to a distinct 
species. 
In many of the Sciotoville specimens, the fissured tube and other de¬ 
tails of the internal structure of the genus are distinctly shown, but there 
is difficulty in isolating the specimens from the mass. 
A specimen in Prof. Andrews’ collection from Newark, which has the 
beak of the ventral valve somewhat less elevated than usual, and the area 
considerably vaulted, presents on the cast of this valve generic (?) char¬ 
acters which have not before been noticed. The whole width of the broad 
sinus, in the middle of the valve, is occupied by a pair of very peculiar 
occlusor scars, separated by the shallow impression of a low median ridge. 
Each scar appears somewhat like the representation of the head of a sheaf 
of wheat—the divergent and pendent heads of grain being turned toward 
the extremities of the shell. The two scars together are an inch broad, 
and of equal length. These characters recur in a specimen from Shafer’s, 
Pennsylvania. 
I have some suspicion that Syringothyris typa is identical with Spirifera 
capax, Hall. The principal distinction, so far as I observe, consists in 
the lobular, anterior prolongation of the ventral sinus of the former. In 
a specimen having a transverse diameter of 34 inches, and a height of 
area of If inches, the ventral sinus projects three-fourths of an inch be¬ 
yond the general front of the shell. All of my specimens present this char¬ 
acter ; but it does not appear in the description and figures of S. capax. 
As this is a character which probably bears a relation to the age of the 
shell, it may be that S. capax was described from immature specimens. 
If so, this species should be known as Syringothyris capax. 
Spiiiigera Hannibalensis, Swallow (St. Louis Trans, vol. I, p. 649). 
Several good casts from bed No. 4, Sciotoville, some of which show both 
valves. Impressions of the exterior are common, showing that this spe¬ 
cies flourished to luxuriant dimensions. A pair of spines is preserved, 
with a bit of smooth shell attached. 
Spirigera Ohiensis, Win. (Proc. A. Nat. Sc.i., Phil., July, 1865, p. 
118.) From bed No. 4, Sciotoville, Ohio. 
RhynchoinELLA Sageriana, Win. (Proc. Acad. N. Sci., Phil., Sept., 
1862, p. 407.) Six specimens from dark bituminous shales, Tennessee. 
Also, from Newark, Ohio ; bed No. 4, Sciotoville ; Granville (abundant ,) 
and from “ Cincinnati Furnace,” Vinton county, where it is of frequent 
occurrence. 
This is a common and widely distributed species. I have heretofore 
known it from remote parts of Michigan, and from Medina, Ashland, 
Cuyahoga, Summit and Licking counties, Ohio. 
Rhyechonella Missouriensis, Slium. (Mo. Report II, 204.) From 
bed No, 4, Sciotoville, Ohio. 
Rhynchohella Marshallensis, Win. (Proc. A. N. S., Phil., Sept., 
1862.) From Granville, Licking county, Ohio. 
A. p. s.— vol. xri—B. 
