362 A, Winchell on supposed New Cephalopods. 
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 14 inches; last interseptal space 42 near the dorsum ; 
depth of lateral sinus not more than -10. 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 strie. | 
Among foreign species it recalls NW. ingens Martin, but the sec- 
tion is less circular and the septa are more sinuous. Cae 
Cyrroceras TESSELATUM ? = i: 
de Kon. (An. Foss., p. 529; pl. xlviii, 5). a ee 
possess 
long and four-tenths broad, and could not have been made! 
any body which has heretofore come under my observation rom 
the Marshall sandstone. sgt a 
moderately im into the outer; transverse section va 
from an ellipse of small excentricity to an oblong figure; sur 
th. A and outer chamber not seen. Septa close, 
ral saddles of form similar to the principal lobes, but regularly 
rounded at the extremity; first accessory saddle, half the 812 
the second, imperfectly developed. _ ta ae 
ameter of largest specimen seen 1°75 (100); major axis © 
transverse section ‘59 (84); minor axis ‘47 (27); length of dor- 
sal lobe -26 (15), of which the cusp is about ‘07 (4); greatest 
breadth ‘12 (. Diameter of siphon ‘015 (0°9). 
Localities. The most abundant Goniatite in the feebly ¢ 
‘mented, ferruginous sandstone at Marshall. Found also 1n ® 
Similar rock at Moscow, and numerous other localities 
‘dale and Jackson counties. It occurs in the hard bluish ¢4 
Teous sandstone at Battle Creek and in the hard purple sandstone 
a This Gonatieb Saginaw Ba 
¢ 
belongs to the ‘sein which embraces G. Hens 
serpentinus, d mixolobus of Philli “td 
distinct from all. 
an 
study it seems sufficiently 
