BULLETIN OF THE LABORATORIES 
58 
Genus Phillipsia. 
Phillipsia SWallovi, Shumard. 
Froetus swallovi, Shumard. Geol. Surv. Missouri. 
“Head semi-circular, swollen, exterior border narrow, slightly 
elevated and marked with 4 or 5 thread-like striae ; sinus of the border 
shallow and indistinct ; posterior border of cheeks rather wide, and 
limted internally by a shallow, but distinct groove ; genal angle 
short and round?; glabella tumid, elevated above the plane of the 
cheeks ; occupying about four-fifths the entire length of head, rather 
more than half as wide as long ; front rounded ; sides convex in ad- 
vance of the eyes ; slightly concave in the middle, and expanding 
again posteriorly ; lobation indistinctly marked by three very shallow 
depressions on each side, the anterior and middle ones being nearly 
obsolete ; occipital segment wider than the base of the glabella ; occip- 
ital furrow slightly arched toward the front, narrow, rather deeply im- 
pressed, widest at the extremities; the furrow which separates the gla- 
bella from the cheeks [facial suture] is narrow, flexuous and slightly 
impressed ; palpebraral lobes semi-oval, visual surfaces minutely retic- 
ulated. Thorax with 9 segments ; axial lobe elevated, width greater 
than lateral lobes [pleural portions], rings rather wide, flattened in the 
direction of the axis ; pigidium parabolic, moderately convex ; length 
about equal to head; border rather wide; axial lobe elevated, as wide 
as lateral lobes; segments eleven, lateral lobes about seven, indistinct. 
Whole surface minutely punctuate; the punctures sometimes disposed 
in quincunx, and sometimes irregularly. Length of head, 3^ lines; 
greatest width, 6 lines.” 
The species is described from the Ghemung, at Chouteau Springs, 
Cooper Co., Missouri, but it is suspected that the formation will be 
found to be really sub-carboniferous. 
Phillipsia shumardi, Hen-ick. 
Proetus niissouriensis^ Shum., Geol. Surv. Missouri. 
Glabella tumid, greatest height about the centre, ovoid, obtusely 
rounded in front, truncated posteriorly, length a little greater than width, 
widest behind, three furrows on either side; posterior pair strongly 
marked, these commence at the dorsal sinus about one-third from 
base to front, pass in a curve backward, and bifurcate about midway 
between the sides and middle of the glabella, one branch very shallow, 
