p. 20

23

Geological Formation and Locality. In limestone of the age
of the Niagara Group, Racine, Wisconsin. Dr. P.R. Hoy,
T.J. Hale, James Hall.

GENUS CARYOCYSTITES, VON BUCH
CARYOCYSTITES CYLINDRICUM, (n.s.) [penciled See Vol 1 p 69]

Description. Body elongate-obovate, or sub-cylindrical;
rounded at top and abruptly contracted at base near the junction
with the column; basal plates undetermined. The first range
above the basal series consists of eight elongate hexagonal plates.
their length once and a half the greatest width, gradually ex-
panding in width from below upwards. These are succeeded buy
a second, third, fourth and fifth range of eight plates in each, all
somewhat regularly hexagonal, their length a little greater
than the width. Of these, the fourth range is usually the
widest, situated at a little more than one third the length of
the body from the summit, and at the point of greatest diameter.
The sixth range above the basal plates are much smaller than
the others, and narrowest at their upper ends. Alternating
with the last there is a seventh range of smaller plates, sur-
rounding those of the summit and enclosing the summit open-
ings. Column small, round, rapidly tapering below the point
of attachment. Surface characters unknown.
The above description is drawn from specimens which are
casts. The divisions of the smaller plates are seen, and one
of the apertures of the summit is well marked on several indi-
viduals; but the ovarian aperture (which is described as being
on the side towards the lower part of the boyd in CARYOCYS-
TITES,) has not been satisfactorily determined. The surface
appears to have been coarsely granulose.
Geological Formation and Locality. In limestone of the age
of the Niagara group at Racine, Wisconsin. Dr. P.R. Hoy,
James Hall. Grafton, Wis., Edward Daniels.

CARYOCYSTITES ALTERNATUM, (n.s.) [pencil Vol 1 p 69}
Description. Body extremely elongate, sub-cylindrical, the
greatest diameter near the apex, extremity with irregular
constrictions near the middle in some specimens. Summit
irregularly rounded, flattened, or depressed on the side of
the aperture; base gradually tapering to the summit of the
column. The body is compose of several (twelve) ranges
of plates, varying in size and shape; in some of the ranges
they are large, mostly octagonal, eight in number, in a range;