p. 21

24

in others they are much smaller, pentagonal or hexagonal, and
about twice as many as in the ranges of larger plates; these
ranges alternate with each other. Near the summit, between
what appears to be the eleventh and twelfth ranges of plates
from the base there is a distinct lateral opening, with another
somewhat smaller opening more nearly on the summit, corres-
ponding with the mouth and anal opening as described by
Von Buch; but the lower lateral apertue (ovarian aperture)
has not been recognized; most of the specimens being broken
near the base, and weather on one side. Surface characters
unknown.
The specimens, like those of the last species, are casts, but
the characters given above are distinctly seen in several indi-
viduals. The structure of the body does not very well corres-
pond with the generic characters of Caryocystites, and it may
be necessary, when more perfect specimens are discovered, to
designate it by another name.
Geological formation and locality. In limestone of the age
of the Niagara Group.
Collector. T.J. Hale

BRACHIOPODA
LINGULA POLITCA, (n.s.) [pencil in Vol 1 p 21}
Description. Shelll small, short ovate, the greatest width near
the front, which is broadly rounded; beaks obtusely rounded;
valvas moderately convex, with prominent umbones. Surface
glabrous, or marked by very fine concentric lines of growth.
The interior of the ventral valve shows a distinct spatulate
muscular impression in the center, with raised margins, and
fainter impressions at the sides. There is an obtuse dental
process on each side of the rostral cavity.
This species differs from L. prima in the prominence of the
of the umbones, and in being destitute of lamellose concentric
lines of growth. The shell was referred by Dr. D.D. Owen
to OBOLUS, but I am unable to find satisfactory evidences of
the features of Obolus; neither do the characters correspond
with true Lingula. [penciled in asterisk]
Geological formation and locality. In Potsdam sandstone,
in beds below those containing Conocephalus and Arionellus,
at Trempealeau, Wisconsin. Edward Danials, James Hall.

LINGULA AURORA, (n.s.)
Description. Shell of moderate size, broadlu subovate; beak
appressed, obtusely pointed; cardinal borders strongly diverging.
[pencilled in - asterisk Obolella - Billings?]