Cephalon strongly convex, semicircular in outline; the location of
the dorsal furrows indicated by two almost imperceptible grooves


OcTOBER, 1913. NEw TRILOBITES — SLOcOoM 55


leading up to longitudinally elongate depressions situated just in front
of a line joining the anterior edges of the eyes and somewhat nearer to
the eyes than to the median line of the cephalon. These depressions
appear as sublunate grooves on the casts, but on the surface of the test
only as a slight flattening. The regular curvature of the cephalon,
aside from the flattening just referred to, is interrupted only by the
palpebral lobes. Eyes far apart, situated at about half their length
from the posterior margin of the cephalon. Facial sutures originate on
the posterior margin of the cephalon on a level with the lower edges of
the eyes, from whence they pass forward and upward around the eyes,
thence obliquely downward to the antero-lateral margin of the ceph-
alon. Free cheeks small, genal angles obtusely rounded. Occipital
ring not discernible on either test or cast.
Thorax composed of ten segments, smooth and flat, gradually
narrowing to the almost obsolete dorsal furrows, at which points they
bend backward and downward to the lateral margins; the axis occupies
about two-thirds of the width of the thorax; eet furrows appear on
the casts as two parallel grooves.
Pygidium strongly arched, transversely oval, Rac about two-
thirds the width, no trace of the dorsal furrows.
Five specimens were used by the writer in making this description.
