A. Winchell on supposed New Cephalopods. 357 
in length, partly septate. It isa fragment of a shell about 8°3 
inches long, having a major apical angle of 11°. The section is 
elliptical, with the minor axis to the major as ‘24: -45=1°88. 
first two septa are ‘08 apart, and the ratio of this interval 
to the larger diameter at the same point is 625. The septa are 
deeply concave, oblique, and slightly sinuous, having one side 
‘12 in advance of the other. The greater diameter of the speci- 
men is ‘7 at one end and ‘45 at the other. 
Toa ty. In the Marshall sandstone at Hard Wood Pt. one 
mile 8.W. of Pt. au Pain Sucre (called also Flat Rock Pt.) on 
the shore of Saginaw Bay. 
ORTHOCERAS RETICULATUM. ? 
Phillips (Geology of Yorkshire, vol. ii, p. 238; pl. xxi, fig. 11). 
marked by longitudinal and transverse strie; the 
former are fine, raised, equidistant, 18 or 14 being embraced in 
the space of one-tenth of an inch; the latter consist of two sets 
—first, a set of irregular inequidistant, impressed strize of which 
occur in the space of one-tenth of an inch; secondly, a set 
of fine, regular, equidistant, filiform strie, of which about 82 
Secur in the space of one-tenth of an inch. The latter give a 
‘finely moniliform appearance to the longitudinal stri, but they 
are most distinctly seen after the exterior of the shell has 
temoved. Characters of the siphon and septa unknown. 
Locality, In the Marshall sandstone at Marshall. 
is furt 
h . 
hundredth of an inch wide. These seem to increase by inter- 
sive Tings, from center to center, are ‘15, 18, ‘21 and °21. 
Locality. Marshall. 
