MR. H. N. MOSELEY ON THE STRUCTURE OE THE STYLASTERJDiE. 
47 L 
it from this association, and probably points to the existence in it of a gastrozooid 
bearing tentacles. 
The separation of the genera Allopora and Stylaste r 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 de 
Iff) urt ales sent me specimens of iStylaster roseus and Allopora miniata in spirit, 
both species of their 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 in form to 
correspond 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-svstems 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 M. Edwards and Haime, as already remarked by Count de 
Pourtales'" and myself,! does not seem in any way separable from Cryptohelia. 
Short characters of the several genera of the Stylasteridse are given in the table 
immediately following ; more extended descriptions follow. 
* “ Deep Sea Corals,” l.c., p. 34. 
t H. N. Moseley. “ On tlie True Corals dredged by H.M.S. ‘ Challenger,’ ” Proc. Roy. Soc., No. 170, 
1876, p. 55 7. 
P 
MDCCCLXXVIII. 
