REPORT ON CORALS—HYDROCORALLINE. 73 
Soft structures of Cryptohelia pudica (Pl. 1X.). 
Cenosare.—This differs in structure in no essential particular from that of Astylus 
subviridis. Similar axial canal systems are present in the branches and similar surface 
networks, but these latter are finer and more complicated in the present form than in 
Astylus. The lid and its support consists of a reflection of the surface layer of ectoderm, 
beneath which is a prolongation of the surface network of the ccenosarcal canals, and in 
the thicker portion of the stem of the lid run abundance of prolongations of the deeper 
and larger vessels (Pl. IX. L). Rounded nematophore sacs, closely similar to those of 
Astylus subviridis, are dotted about over the upper surface of the lid, and, as in Astylus, 
a single one of these bodies is placed at the margins of each cyclo-system over the 
outer extremity of each pseudoseptum (Pl. IX. NN). The pigmented endoderm cells 
are coloured brick-red as in Sporadopora dichotoma. 
Zooids.—The zooids of both kinds most closely resemble those of Astylus subviridis. 
Dactylozooids.—These are elongate conical in form, tapering to a point. Their 
bases are attached as in Astylus subviridis. In retraction the part of them nearest the 
base is doubled back in the wide slit-like chamber of the dactylozooid towards the 
periphery of the cyclo-system, and then the remainder of the zooid is bent over in the 
reverse direction and doubled down into the mouth of the gastrozooid (Pl. IX. D Z). 
Gastrozooids.—These are flask-shaped and closely similar in structure to those of 
Astylus subviridis, being, like it, devoid of tentacles (Pl. XI. fig. 1). The mouth appears 
at the flat summit of the neck of the flask as a cruciform aperture. The cavity 
of the zooid is lined with the usual gastric endodermal cells of elongate form, and the 
layer formed by these cells becomes, as in the gastrozooids of Sporadopora dichotoma, 
thinner as the base of the zooid cavity is approached. There is a thick investing 
ectoderm layer in the-upper part of the zooid, between which and the endoderm layer 
is a well-marked layer of longitudinal muscular fibres, which fibres are, as in Sporado- 
pora, continued for insertion along the main canal offsets of the base of the zooid 
(ET Xs My: 
The gastrozooid sac is attached just beneath the origin of the neck of its flask-shaped 
mass. ‘The main canal offsets spring from the periphery of the rounded base of the 
zooid, with a radiating disposition (Pl. XI. fig. 1). They curve upwards to be distri- 
buted as in Astylus subviridis. The calcareous wall of the upper chamber of the 
gastropore lies in the interval between these canals and the outer surface of the sac of 
the zooid. No canals spring from the under surface of the zooid. 
Gonophores.—A fragment of a male specimen of Cryptohelia, obtained off the 
Japanese coast, was examined in a cursory manner, and it was seen that, at first sight 
at least, it resembled Astylus subviridis in the structure of its gonophores. Unfortun- 
ately it was mislaid, and I have been unable to find it again. 
(ZOOL, CHALL, EXP.—PART vil.—1880.) G 10 
