6o 
BULLETIN OF THE LABORATORIES 
face very finely punctate, punctse rather distant and arranged some- 
what in quincunx ; margin rather broad and smooth ; axial lobe strongly 
arched transversely, gradually tapering, forming not quite four-fifths 
the total length ; its width equal to about three-fourths the width of 
lateral lobe; rings about i8, rounded on the dorsum and flattened at 
die extremities, transverse furrow narrow, distinctly impressed on the 
dorsum, becoming obsolete before reaching the longitudinal furrows ; 
lateral lobes rather strongly arched transversely ; anterior margin an- 
gulated, apex of angle elevated and situated nearest the axial lobe ; 
segments eleven, rounded, curving slightly downwards, not furrowed; 
furrows between the segments rather deeply impressed, except the two 
posterior ones, which are quite shallow. Length, .68; width, .76; 
length of axial lobe, .56; width, .23. 
Such a description of a pigidium simply can have but a local 
value. 
PJliUipsici major, Shumard. 
Pigidium [only part known] large, elevated, approaching to semi- 
elliptical, a little wider than long; surface smooth, or very finely 
punctuate; outline of edges sinuate, margin broad, particularly to- 
ward the posterior extremity ; axial lobe very much elevated, gently 
tapering, forming five-sixths of the total length, not so wide as the lat- 
eral lobe, rather strongly arched longitudinally, sides with a broad, 
shallow groove running their whole length ; rings 23, very strongly 
arched from side to side to side, angulated in the lateral depressions 
and their extremities directed obliquely backward. The first 6 or 7 
from the front are very flat in a longitudinal direction, and are sepa- 
rated from each other by fine, scarcely impressed, transverse lines or 
furrows. Posterior to these the furrows are distinctly impressed to the 
extremity of the lobe, while the rings become gradually more rounded 
on the dorsum, but on the sides they still continue flattened. Lateral 
lobes moderately convex, obtusely angulated in front ; segments 12, 
rounded, slightly sinuate, simple; furrows rather strongly impressed, 
except the two last, which are nearly obsolete. Width, 1.20 in.; 
length, T.io; length of axial lobe, .93; width at anterior extremity, .30. 
This very large species has several peculiarities which may make 
it possible to recognize it from the description. It is said to have been 
derived from the upper coal measures in Kansas. 
Meek was apparently in error in identifying the specimens figured 
