$0 THE VOYAGE OF H.M.S. CHALLENGER. 
the genus Lepidopora and Errina aspera. Pourtalés originally placed his Lepidoporas 
under the genus Errina. 
I have examined the structure of the soft parts of Lepidopora cochleata (Pourtalés) 
in specimens preserved in spirit kindly placed at my disposal by him for the purpose. 
The specimens were not in very good preservation, but I was able to see that the 
form very closely resembles Errina labiata in the structure both of its ccenosare and 
zooids. The dactylozooids are extremely numerous. The gastrozooids have four 
tentacles. The nematophores are like those of Errina. The specimen was a female. 
The genus Stenohelia (Kent) was originally formed to include Allopora madeirensis, 
which seems to come very near to Astylus and Cryptohelia in that it has the cyelo- 
systems all directed towards one face of the flabellum ; but the presence of a style in the 
gastropores is decisive in excluding it from this association, and probably points to 
the existence in it of a gastrozooid bearing tentacles. 
Possibly the name of Verrill’s genus Cyclopora, founded on the species Cyclopora 
bella [Stylaster bella (Dana)] should be substituted for that of Conopora, for Cyclopora 
bella appears to be without a style in the gastropore, and Conopora tenws (Moseley) 
might perhaps be referred naturally to the same genus, but the descriptions in the old 
terminology are insufficient to determine the point. 
The separation of the genera Allopora and Stylaster is difficult. The different 
forms of the gastrozooids, and the presence in that of one genus of six, and in that 
of the other of twelve tentacles, may prove characteristic of the genera. Count 
Pourtalés sent me specimens of Stylaster roseus and Allopora miniata in spirit, 
both species of these genera different from those of which I had determined the 
anatomy. The soft parts were, unfortunately, badly preserved in the specimens, but 
the gastrozooids, although their tentacles could not be counted, appeared to correspond 
in form with those before observed in the other species of the same two genera. 
A tendency to alternate budding can be made out in all Alloporas. It seems probable 
that the strong tendency to the development of the cyclo-systems on the sides of 
the branches only in the flabellum will prove a good characteristic for the separation 
of the Stylasters from the Alloporas, which would then include all those species in 
which the faces of the stem and branches were covered with cyclo-systems. The 
genus Endohelia of Milne-Edwards and Haime, as already remarked by Pourtalés* and 
myself,’ is not in any way separable from Cryptohelia. I have examined the type 
specimen which was sent to me by Dr H. W. Hubrecht from the Leyden Museum for 
the purpose, and, in the absence of knowledge of the soft structure, should refer it to 
Cryptohelia pudica. Short characters of the several genera of the Stylasteride are given 
in the tabular synopsis immediately following ; more extended descriptions follow. 
1 Deep-Sea Corals, l.c., p. 34. 
° H. N. Moseley, On the True Corals dredged by H.M.S. Challenger, Proc. Roy. Soc., No. 170, 1876, p. 557. 
