7 
The coste are direct continuations of the septa, and, therefore, 
also in six systems, with four cycles. They are broader than 
these, sub-equal and prominent on the wall, and with deep inter- 
spaces. "Their edges are serrated, but less strongly than those of 
the septa. Curving sharply round inferiorly, they are continued 
on the base, where they converge from its circumference to the 
centre, and gradually diminish in breadth. Тһе same deltoid 
combinations also occur, the primary costæ being free, while the 
remaining orders unite like the corresponding septa of the calice ; 
the primaries and secondaries reach the centre as very fine lines. 
The examples vary much in size. The largest in the collection 
is 11 mm. in diameter and 5:5 mm. high. From this there are all 
gradations to the very smallest, which are nummiform in shape 
and between 3 mm. and 4 mm. in diameter. The type, a com- 
paratively large specimen, is 9 mm. in diameter and 4:5 mm. high. 
Examples of this coral were dredged in all but two of the 
fourteen stations mentioned by Dr. Verco, and generally in great 
abundance. The depths given range from 9 to 22 fathoms. 
The only described species with which it is necessary to compare 
the present coral is Delfocyathus Italicus, Edwards and Haime. 
As a recent form this is only known to me from the descriptions 
given by Pourtales, Lindström, and Moseley ; buv the fossil coral 
from Cape Otway, identified by Duncan as D. Italicus, var. Aus- 
traliensis, is well represented in my collection. As Duncan 
states, it is in the shape of a very short cone— which agrees with 
Edwards and Haime’s figure of the type specimen from the 
Tortona miocene. The drawings of recent examples of the same 
species, as given by the three authors mentioned, indicate also a 
conical-shaped coral; whereas D. Vincentinus is cylindrical, with 
a flat base and a low, perpendicular wall. 
ASTRÆIDÆ. 
Genus HoMoPHYLLIA, Brüggemann (1877). 
Duncan, in his * Revision," makes this genus à synonym of 
Antillia, which he established in 1863 for the reception of some 
West Indian corals ; but Brüggemann had already pointed out 
that Homophyllia was distinguished from Duncan’s genus by its 
circular development, attachment, thin epitheca, the dentate 
character of its septa, and the small columella. Professor 
Gregory, who has examined Duncan's West Indian corals, doubts 
the validity of Ат Па, and divides its species among Lithophyllia 
and Circophyllia.* Оп account of its scanty endotheca, as well 
as other peculiarities, the species for which Homophyllia was 
founded, viz, Milne Edwards and Haime's Caryophyllia 
australis, cannot enter either of the genera mentioned, and 
* Q.J.G.S., Vol. nr. (1895), p. 260. 
