Page 189

                    The Corals of Delafield.                1SR
author states that the number of rays found on these star-like
prominences is from eight to twelve. Ours display from five to
eighteen of these processes. The raised hexagonal border which
he notes in the interspaces between the stars is shown in but a
single specimen in our collection, and only imperfectly there.
The star-like prominences in our specimens are much more irreg-
ular in form and arrangement, and the pores occupying the inter-
stellar spaces have plainly-marked raised rims as in the genus
Trematopora heretofore described.
  Closely resembling this species in some of its forms stands a
newly described species Jilonticulzporacpunctata, (An. iReport, Wis.
Geol. Sur. p. 71). This is a very variable form, especially as
to surface markings.  It is a cylindrical, branching coral, the
stems varving from one-eighth to three-fourths of an inch in
diarrmeter. Some specimens display tubercular prominences very
closely resembling those of the form last described; others show
none of these raised figures. The surface of all specimens
referred to this species is studded with non-cellular, minutely
porous interspaces separated by surfaces marked by cells and
pore-marked walls, just such as are shown by representatives of
the genus Fistulipora.  About these interspaces the larger cells
are sometimes arranged in radiating lines or ridges. In these
forms the resemblance to S&ellipora is very marked to the unas-
sisted eye. Under the lens, however, the arrangement of cells,
cell walls and porous surfaces of cell walls and interspaces brings
out the resemblance to the other genus just mentioned.  The
only marked difference between this form and those described as
lisltuhbora is the presence and prominence of the interspaces, and
these are mentioned by Dr. Rominger, of Michigan, as character-
iqtic of the latter genus. - This author would doubtless place it at
once under that genus.
  We present also three other very closely allied forms of the
genus Jlfonlt~ouic poa. These are nearly alike in mode of growth,
of branching, and in thickness of cell walls.
  A detailed description of the first species will serve as a basis
for all. Prof. Whitfield describes it as growing in strong, solid,
somewhat flattened, frequently branching stems, covered with