Wincli ell.] 
24:8 
[Jan. 4, 
Lingula subspatulata? M. & W. (Ill. Geol. Rep. Ill, 437, pi. 13, fig. 
1). From Tennessee, and No. 6, Rockville, Ohio. The single specimen 
from Tennessee, showing the inside of (apparently) the ventral valve, is 
not over one-tliird the length of the specimen figured in the Illinois Re¬ 
port ; hut it otherwise agrees with the description in outline, surface 
markings, position of Leak and faint radiating lines along the middle. 
Lingula subspatulata was described from the “ Black Slate,” of Union 
county, 111. At Yanceburg, Ky., and other localities on both sides of the 
Ohio river, is a black shale embraced within the Waverly series, (see No. 
6, Andrews’ section) which contains a small Lingula , not easily distin¬ 
guishable from the Tennessee specimen. If the Ohio, Kentucky, and 
Tennessee specimens are really identifiable with the Illinois species, it ap¬ 
pears strange that the latter should be found in a geological position so 
much lower. There seems to be occasion for the query, whether the Illi¬ 
nois equivalent of the Yanceburg Shale has not become confounded with 
the 4 ‘ Black Shale, ’ ’ by the disappearance of intervening beds ; and also, 
whether the entire mass of the “Black Shale,” of southern Ohio, Indi¬ 
ana and Illinois, does not, in fact, belong in a position considerably above 
the Genesee Shale, as Yerneuil, Owen and others long ago suggested. 121 
1 am led to suspect that L. subspatulata , M. & W., is identical with my 
L. membranacea ; 122 
Lingula membranacea, Win. (Proc. Acad. N. S., Phil., Jan., 18G3). 
From near Shafer’s, Penn. 
Piscina Saffordi, n. sp. 
Shell rather small, outline nearly circular, but generally a little flattened 
posteriorly, and also on each of the postero-lateral boundaries. Upper 
valve rather depressed conical, with the beak midway between the centre 
and the posterior side ; under surface presenting a faint but distinct 
linear ridge extending anteriorly from the beak one-fourth the diameter of 
the shell. Lower valve very depressed convex, with an apical pyriform 
indentation having a blunt spur projecting from its broad anterior end ; 
no perforation visible. Exterior of both valves ornamented with numer¬ 
ous fine, unequal, concentric striae ; interiors smooth, except the faint 
vascular markings near the borders. 
This curious species most resembles in general appearance, Discina Lo- 
densis, from the Genesee Shale ; but the pyriform indentation of the ven¬ 
tral valve, the finer external striae and the inconspicuous foramen will 
serve to distinguish it. 
From dark bituminous Shales just above the “ Black Slate,” of Hick¬ 
man county, Tennessee. 
i2i The “Black Shale,” of northern Ohio, Ontario and Michigan, is undoubtedly the “ Genesee,” 
as is proven both stratigraphically and paleontologically. (See Proc- Amer. Phil. Soc., No. 81, p. 
77, &c.) 
i221 take occasion to remark that Gyroceras? Roclfordensis, M. & W., (Ill. Rep. Ill, p. 459) from 
Rockford, I nd., is identical with my Cyrioceras Roclcfor dense, described in Proc. Acad. Nat. Sci. 
July, 1865. 
