462 MR. H. N. MOSELEY ON THE STRUCTURE OF THE STYLASTERIDyE. 
spermatozoon appears to be developed out of the nucleus of the cell, which as the 
process proceeds becomes first attached to the wall of the cell on one side, and is then 
gradually drawn out in the form of a, curved elongate mass along the wall of the cell 
until it assumes the form of the head of the spermatozoon, being curled round within 
the cell nearly into a circle. The various stages in development are shown on 
Plate 43, fig. 11. 
The mature spermatozoa were not observed in the fresh condition. Their appear- 
ance as seen in specimens hardened in alcohol is shown on Plate 43, fig. 11, g. They 
form closely felted masses within the ripe lobules, which masses do not entirely fill 
the cavities of the inner sacs of the lobules. 
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 43, 
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 without 
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 develop- 
ment from endoderm cells, in the present instance, may be entirely misleading ; the 
presence of hard skeletons in the Stylasteridae unfits them for research on such points. 
It seems improbable that they differ in this respect from other Hydroids. E. Van 
Beneden* has shown that in Hydractmia the spermatozoa are developed from the 
ectoderm, and G. v. Koch t has observed the same fact in two species of Tubularia. j 
(8.) GENUS CRYPTOBELIA (M. Ed. and H.). 
A deep sea coral, dredged in many parts of the world by the ‘ Challenger,’ is 
refer aide to the above genus, and although the specimens vary a great deal, seems 
not distinct from Milne Edwards’ and Haime’s species, C. pudica. The specimens, 
the anatomy of which is here described, were dredged off the mouth of the La Plata. 
Cora, Hum of Cryptohelia pudica. 
The corallum 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. 
* Recherches faites au laboratoire d’enibryologie de l’universite de Liege- Vol. 1, 1876, p. 2. 
Mittheilungen fiber Caelenteraten. MorpLol. Jabrbnch. Bol. II., 1876, s. 84. 
| Note added Sept. 24, 1878. The matter, however, seems variable or as yet undetermined. 
§ Milne Edwards et J. Haime. Ann. des Sci. Nat., 3 e ser., t. xiii., plate 3, fig. 1, 1850. 
|| Hist. Nat. des Coralliaires, Paris, 1857, t. ii., p. 127. 
