MR, H. N. MOSELEY ON THE STRUCTURE OF THE STYLASTERlDiE. 
495 
P, P. Mouths of the sacs of the dactylozooids, occupying in the recent 
condition the dactylopores. These mouths are in this species 
elongate in outline, and simulate the interseptal spaces of antlio- 
zoan corals. 
G, G. Male gonophores in special sacs, and springing from branches of 
the ccenosarcal network. 
C. Deep axial coenosarcal canals, of the branches of the coral on which 
the cyclo-systems rest, 
S, S. Superficial networks of finer canals lying immediately beneath the 
superficial external layer of the ectoderm. 
R, R, Radially disposed offsets of the coenosarcal network springing 
from the sac of the gastrozooid. 
X, X. Inter- radial spaces (cf. Plate 39, R R, X X). 
Fig. 2. Shows the structure of the soft parts of a female stock of Pliobothrus sym- 
metvicus. The structure is exposed by means of a section vertical to the 
surface of the coral. The mass of the coral, the hard skeleton being 
removed, is composed of the usual coenosarcal meshwork which is bounded 
externally by a continuous surface layer of ectoderm containing large 
nematocysts. Embedded in the meshwork are two kinds of zooids and 
the gonophores. The sac or sheath of the single gastrozooid shown in the 
figure is opened in order to display the zooicl within. 
Z. Gastrozooid. S placed in the neck of the sac of the gastrozooid. 
X, X. Spaces in the meshwork corresponding to the inter-radial spaces 
in Sporadopora. Here the radial arrangement is hardly to be 
discerned. 
D Z, D Z. Dactylozooids. The transverse lines drawn incircling the 
bodies of these zooids indicate folds into which the bodies of the 
zooids are thrown in extreme retraction. 
O. Rests on a cup-sliaped spadix, bearing a mature unimpregnated 
ovum, containing a germinal vesicle. 
G. Impregnated ovum in an early stage of development. 
P. Planula nearly mature contained within its sac. 
Fig. 3. Male gonophore of Pliobothrus symmetricus. 
PLATE 42. 
Shows the structure of the soft parts of the Cryptohelia pudica displayed by 
decalcification. 
The figure represents two cyclo-systems of zooids, together with the short branch 
of the coral connecting them. The cyclo-system on the left hand in the figure is 
represented as laid open by a vertical cut passing through the axis of the gastrozooid, 
MDCCCLXXVIIL 3 s 
