REPORT ON CORALS—EXPLANATION OF PLATES. 211 
S. Style of the gastrozooid. 
A. Circlet of small rough projections of the ccenosteum, which stand out 
from the wall of the gastropore just above the top of the style. 
DZ, DZ. Dactylopores of the cyclo-system. 
P. Walls of the ccenosteum separating the adjacent dactylopores from one 
another, the pseudesepta of the cyclo-system. 
S’. Style of a dactylozooid. This is seen adhering to the outer wall 
of one of the dactylopores, which is laid completely open in order 
to show it in situ. 
Fig. 4. Portion of the ccenosteum of Spinipora echinata enlarged to show its outward 
form. The ccenosteum is covered with long grooved spines, which carry 
the larger dactylozooids. On the sides of these spines, and about their 
bases, are numerous simple or slightly lipped smaller pores, occupied by a 
smaller form of dactylozooid. Deeper in between the bases of the spines 
lie the pores of the gastrozooids, provided each with a style. 
DZ,DZ. Pores of the larger dactylozooids, appearing as grooves in 
the long projecting spines. 
DZ’, DZ’. Pores of the smaller dactylozooids. 
GZ, GZ. Pores of the gastrozooids. 
g. 5, Portion of the conosteum of Labiopora antarctica much enlarged. From a 
drawing by Mr Charles Stewart, F.L.S. 
GZ, GZ. Pores of gastrozooids with their styles just visible in their depths. 
DZ, DZ. Pores of larger dactylozooids. 
DZ, DZ’. Pores of dactylozooids of the smaller kind. 
Fig. 6. View of one of the inner surfaces of a fragment of the ccenosteum of Distichopora 
coccinea, which has been split in half through the line formed by the 
pores of the gastrozooids ; showing the arrangement of these pores, and 
their very long styles. 
GZ, GZ. Pores of gastrozooids. 
GZ’. Young similar pore which has as yet little depth. 
8, 8, S. Styles; that on the extreme left remarkably long. 
ig. 7. Somewhat diagrammatic view of a zooid system of Cryptohelia pudica, divided 
j vertically in half by a section passing through the axis and in the 
direction of the length of the branch on which the system is situate. 
ee 
° 
The dotted areas indicate cut surfaces of calcareous substance, the 
structure of which is not filled in in the drawing. The gastropore 
consists of two portions, an upper and a lower, separated from one another 
by a circular constricted aperture. The wall of the upper portion ends 
below in a thin incurved border bounding the circular aperture, and from 
