248 TRANSACTIONS OF THE [JUNE 4, 
separated from the glabella by rather deep furrows. The gla- 
bella has three short lateral furrows on each side, the middle one 
being opposite the anterior end of the palpebral lobe. Eyes 
large, reniform ; occipital ring distinctly marked, somewhat 
triangular in form, and separated from the glabella by a broad 
and well-defined occipital furrow; surface of the glabella coarsely 
granulated. 
Fixed cheeks, narrow behind, forming a palpebral lobe about 
each eye. Limb smooth on its upper surface, but striated along 
its outer margin. The movable cheeks probably terminate in 
cheek spines, but this not indicated in the rolled specimen now 
before us. 
Thorax with nine segments; the axis is strongly marked by 
well-defined dorsal furrows, and elevated above the plane of the 
pleurz ; width greater than the length of the pleure. Pleure 
grooved and faceted. Surface of test smooth. Pygidium semi- 
elliptic, axis very prominent, and forming less than one-third 
the width of the anterior margin, which is gently arched. Axial 
rings seven. The lateral lobes are marked with six ribs on each 
side, which bend rather gently downward and decrease in size as 
they approach the posterior margin of the pygidium. Surface 
smooth. 
Dimensions. —Total length, 20 mm.; length of glabella,5 mm.; 
width of same, 34 to 4 mm.; width of occipital ring, 14 mm.; 
length of thorax, 8 mm.; length of pygidium, 53 mm.; width of 
same, 9 mm. 
Geological position and locality.—Waverly series, Sedalia, 
Missouri, from the cabinet of F. A. Sampson, Sedalia, Mo. 
This species of Phillipsia can readily be distinguished from 
all others by its limited number of axial rings in the pygidium. 
GRIFFITHIDES (?) SEDALIENSIS (n.s.), Vogdes. 
Description.—Pygidium semi-elliptic; axis broad, conical, 
and prominent, occupying a litile less than one-third of the 
width of the pygidium on its anterior border, which is arched. 
Axial rings 12. Lateral lobes marked with 11 ribs. The test 
is covered with a regular series of tubercles, which run through 
