A. Winchell on supposed New Ceplialopods. [362] 13 
tate, must have belonged to a specimen more than 7 inches across 
the outer whorl. The dorso-ventral diameter at the last septum 
is about 1J inches; last interseptal space *42 near the dorsum; 
depth of lateral sinus not more than TO. Another specimen, 
wholly septate, supposed to belong to this species, though more 
rapidly curved, is 1*85 from the dorsal to the ventral side. 
Locality. Marshall. 
This species most nearly resembles the preceding, but differs 
in the absence of an angular section and the two sets of striae. 
Among foreign species it recalls N. ingens Martin, but the sec¬ 
tion is less circular and the septa are more sinuous. 
Cyrtoceras tesselatum ? 
deKon. (An. Foss., p. 529; pi. xlviii, 5). 
A mere impression, undistinguishable from the above, seems 
to possess sufficient interest to deserve mention. It is one inch 
long and four-tenths broad, and could not have been made by 
any body which has heretofore come under my observation from 
the Marshall sandstone. 
Goniatites Marshallensis, n. sp. 
Shell rather long, consisting of at least four whorls, the inner 
moderately impressed into the outer; transverse section varying 
from an ellipse of small excentricity to an oblong figure; surface 
smooth. Aperture and outer chamber not seen. Septa close, 
the lobes almost reaching the nqxt posterior saddles. Dorsal 
lobe twice as long as its greatest width, clavate, with a long cus¬ 
pidate acumination, at the extremity of which can sometimes be 
seen the outline of the minute siphon; first and second lateral 
lobes similar to the dorsal in form, but successively a little 
smaller and not acuminate; accessory lobe obtuse, half the size 
of the second lateral; ventral lobe profound. Dorsal and late¬ 
ral saddles of form similar to the principal lobes, but regularly 
rounded at the. extremity; first accessory saddle, half the size, 
the second, imperfectly developed. 
Diameter of largest specimen seen 1*75 (100); major axis of 
transverse section '59 (34); minor axis '47 (27); length of dor¬ 
sal lobe *26 (15), of which the cusp is about *07 (4); greatest 
breadth T2 (7). Diameter of siphon *015 (0*9). 
Localities. The most abundant Goniatite in the feebly ce¬ 
mented, ferruginous sandstone at Marshall. Found also in a 
similar rock at Moscow, and numerous other localities in Hills¬ 
dale and Jackson counties. It occurs in the hard bluish calca¬ 
reous sandstone at Battle Oreek and in the hard purple sandstone 
at Hard Wood Pt., Saginaw Bay. 
This Goniatite belongs to the group which embraces G. Hens - 
lowi Sow., G. serpentinus , cyclolobus and mixolobus of Phillips, 
but after careful study it seems sufficiently distinct from all. Its 
