MR. H. 1ST. MOSELEY ON THE STRUCTURE OF THE ST YL ASTER] THE. 487 
Fig. 6. Allopora profunda. Natural size. 
Fig. 6 a. Portion of same enlarged. 
Fig - . 7. Errina labiata. Natural size. The form of the stem of the corallum is much 
© 
distorted in places by parasitic annelids. 
Fig. 7a. Portion of a branch enlarged. 
o o 
PLATE 35. 
Fig. 1. Section vertical to the surface of the corallum of Sporadopora dichotoma 
showing the structure of the hard parts. The general mass is seen to be 
excessively porous in appearance, being traversed in all directions by 
canals which, in the recent condition of the coral, contain the elements 
of the ccenosarcal mesliwork. The perforations and canals are smaller 
towards the surface of the corallum, and coarser in the deeper regions. 
The cavities in the mass occupied by the zooids and gonophores are 
excavated within it, and have their walls freely perforated, like the 
remainder of the corallum. 
G Z. Mouth of a gastropore. 
S. Style terminating above in a delicate brush of spicules, 
T. Thin calcareous tabula. 
D Z, D Z. Pores of large and small dactylozooids. 
G. Cavity or ampulla occupied by a male gonophore, which is in this 
genus entirely sunken beneath the surface of the corallum. 
Fig. 2. View of the surface of the corallum of Sporadopora dicliotoma as seen by 
reflected light. 
G Z, G Z. Mouths of gastropores. 
D Z, D Z. Mouths of dactylopores. 
G, G, G. Shallow depressions in which the ampullae open to the surface. 
Fig. 3. Portion of the corallum forming a single calicular system of Stylaster clen- 
sicaulis laid open by a vertical incision in order to show the arrangement 
of the hard parts, and enlarged. 
G Z. Gastropore. 
S. Style of the gastrozooid. 
A. Circlet of small rough projections of the corallum, which stand out 
from the wall of the gastropore just above the top of the style. 
D Z, D Z. Dactylopores of the cyclo-system. 
P. Walls of the corallum separating the adjacent dactylopores from one 
another, the pseudosepta 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. 
MDCCCLXX VTT r. 
