170 GEOLOGICAL SURVEY OF THE TERRITORIES. 
PTERGPOD A. 
Genus CONULARIA Miller. 
CONULARIA CRUSTULA (sp. nov.). 
Plate 42, fig. 4a. 
Shell rather small, having the usual four-sided pyramidal form; the 
four sides being equal, and flat or nearly so near the apex, but slightly 
convex towards the aperture; the four angles distinctly furrowed, and 
a Slender furrow also marks the median line of each side, which furrow _ 
is more distinct upon the cast of the interior of the shell than upon the 
external surface of the test. Surface marked by the numerous trans- 
verse raised striz common to this genus, which arch gently forward from 
each of the four angles; the majority of the striz are continuous across 
the median line of the sides, and also across the angle-furrows, in cross- 
ing which they bend slightly backward. 
Length, 31 millimeters; diameter of aperture, about 16 millimeters. 
This shell is closely like several other known forms, but it possesses 
peculiar interest from the fact that it is the only species known to me 
to occur in the Coal Measure strata of the Mississippi Valley, although 
several species are known in the Subearboniferous strata of that region. 
It is, therefore, the most recent known American species, and adds to 
our knowledge another feature of close relationship between the faunz 
of the upper ‘and lower Carboniferous series. 
Position and locality—Coal Measure strata near Kansas City, where it 
was obtained by Professor Broadhead. Among some Carboniferous 
fossils brought by Prof. E. D..Cope from near Taos, New Mexico, are a 
couple of fragments apparently of this species. 
CEPHALOPODA. 
Genus NAUTILUS Breynius. 
NAUTILUS DANVILLENSIS White. 
Plate 42, fig. 7 a. 
Nautilus danvillensis White, 1878, Proc. Acad. Nat. Sci. Philad., p. 36. 
Shell moderately large; umbilicus deep but not very broad, showing all 
the volutions, at least in large part; volutions apparently four, increas- 
ing rapidly in size, very slightly embracing, subtrihedral in cross-section, 
the two sides of the volution forming two sides of that outline, while 
the inner side of the volution forms: its third principal side; sides of 
the volution plain, nearly flat or slightly convex; peripheral side very 
narrow, concave, and marked at either edge, where it joins the side, 
by a row of longitudinally compressed nodes. The sides are rounded 
abruptly into the umbilicus, which is unusually deepened by the trans- 
verse diameter of the volutions being greater at the inner side than else- 
where. Septa plain, somewhat deeply concave dorso-ventrally, but less 
so transversely; siphuncle subcentral, a little nearer to the peripheral 
than. to the inner side. Surface smooth except the ordinary lines of 
- growth and the two rows of dorsal nodes before referred to. Test thin. 
