488 
MR. H. N. MOSELEY ON THE STRUCTURE OF THE STYLASTERIDHL 
Fig. 4. Portion of the corallum of Spinipora echinata enlarged to show its outward 
form. The corallum 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. 
D Z, D Z. Pores of the larger dactylozooids, appearing as grooves in 
the long projecting spines. 
D Z , D Z . Pores of the smaller dactylozooids. 
G Z, G Z. Pores of the gastrozooids. 
Fig. 5. Portion of the corallum of Labiopora Antarctica much enlarged. From a 
drawing by Mr. Charles Stewart, F.L.S. 
G Z, G Z. Pores of gastrozooids with their styles just visible in their 
depths. 
D Z, D Z. Pores of larger dactylozooids. 
D Z', D Z'. Pores of dactylozooids of the smaller kind. 
Fig. 6. View of one of the inner surfaces of a fragment of the corallum of Distichopora 
eoccinea, 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. 
G Z, G Z. Pores of gastrozooids. 
G Z . Young similar pore which has as yet little depth. 
S, S, S. Styles ; that on the extreme left remarkably long. 
Fig. 7. Somewhat diagrammatic view of a zooid system of Cryptohelia pudica, divided 
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. 
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 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 
the border behind this wall all round a narrowed prolongation of the 
lower chamber of the gastropore passes up, and leads above by a series 
of offsets to the lower terminations of the tubular portions of the dactylo- 
pores, conveying, in the recent condition of the coral, the main canals 
springing from the gastropore. The support of the lid of the pore system 
sends a stout prolongation downwards to fuse with the wall of the upper 
chamber of the gastropore. 
G P. Upper chamber of the gastropore. 
G P . Lower chamber of the gastropore. 
D P, D P. Dactylopoi ■es. 
