REPORT: ON CORALS—HYDROCORALLIN &., 71 
In the cavities of the pedicles of the more mature lobules a tissue containing a 
few transparent rounded cells was seen to be present. This may represent a spadix. 
No rounded spadix such as that occurring in Allopora is present in the interior of the 
lobules. The histological details were preserved with very great completeness in the 
present form when hardened in spirit and decalcified, so much so that Plate X. 
fig. 10, might almost have been executed with a camera lucida from a fine section 
of a gonophore stained with carmine. It is, however, impossible to determine, with- 
out close study of fresh material, so difficult a problem as the determination whether 
the male elements are derived from the ectoderm or endoderm. The apparent 
development from endoderm cells, in the present instance, may be entirely mis- 
leading; the presence of hard skeletons in the Stylasteride unfits them for research 
on such points. 
Cryptohelia, M.-Edw. and H. 
A deep-sea coral, dredged in many parts of the world by the Challenger, is referable 
to the above genus, and although the specimens vary a great deal, they seem not distinct 
from Milne-Edwards’ and Haime’s species, Cryptohelia pudica. The specimens, the ana- 
‘tomy of which is here described, were dredged off the mouth of the La Plata. 
Ceenosteum of Cryptohelia pudica. 
The coenosteum is well figured by Milne-Edwards and Haime,’ and described? by 
these authors as having the form of a small espalier tree, with all the branches 
comprised in the same vertical plane, and all the calicles turned to the same side (Pl. XII. 
fig.7). As far as the form and arrangement of the branches is concerned, the coenosteum of 
Cryptohelia differs in no important particular from that of Astylus subviridis which 
has just been described. The strize on the surface of the branches are in the present 
form finer and run for shorter courses than in Astylus subviridis, and well-marked 
prominent ridges are not formed between them. 
Regular cyclo-systems are present in Cryptohelia, and are all turned towards one 
face of the flabellum. Their mouths are not elevated above and isolated from the 
surfaces of the branches as in Astylus, but the branches swell vertically as well as 
horizontally where cyclo-systems are present, and the coenenchym of the branch thus 
rises ina gradual curve to the level of the margin of each cyclo-system (Pl. XXXV. fig. 7). 
1 Milne-Edwards et J. Haime, Ann. des Sci. Nat., 3 ser., t. xiii., ph iil. fig. 1, 1850. 
* Hist. Nat. des Coralliaires, Paris, 1857, t. ii. p. 127. 
