A. Winchell on supposed New Cephalopods. 361 
Which gives 84 to one-tenth of an inch; depth of lateral sinus 
Localities, Marshall and Battle Creek. 
Navtizus sussutcatus (?) 
Phillips (Geol. Yorks., ii, 233, pl. xvii, 18, 25). 
The general outline of the transverse section is hexagonal, 
with well rounded angles. The sides are nearly plane, and par- 
_ allel with the dorso-ventral diameter, and in the ventro-lateral 
Tegion slope abruptly into the umbilical cavity, making an angle 
with the side, of about 65°. The lateral surface joins the dorsal 
_ atan angle varying from 74° to nearly 90°. At a little less 
eeearently) than half the transverse diameter of the cast, the 
= 
giving 24 in one-tenth of an inch. A fragment of a larger 
Specimen (wholly septate) must have belonged to an individual 
More than 4 inches across the outer whorl. In this, the lateral 
surface is 8, and the umbilical slope *47. 
Locality, Marshall. 
The transverse section of these forms is much less sharpl 
angular than is shown by the figures of European authors, an 
the strize seem to be coarser. 
NavTILus INGENTIOR, 0. Sp. 
Sh . + impressed; transverse section 
ell very large; whorls not imp me ape HS of tho 
