198 MR. HOLDSWORTH ON NEW SPECIES OF FLABELLUM. [June 24, 
4, DescripTion or Two New Species or CoRALS BELONGING 
To THE GENUS FLABELLUM. By E. W. H. Hoxipsworta, 
.F.L.S., etc. 
(Plate XXVIII.) 
1. FuaseLLuUM CAMPANULATUM. (Pl. XXVIII. figs. 1-3.) 
Compressed, campanulate; borders straight or slightly convex ; 
without spines. Base usually terminating in a small pedicel, some- 
times irregularly compressed. Superior margin slightly arched. 
Cell deep and narrow. Border of lamelle entire, sloping inwards 
from the apex for about one-third of their length, thence continuing 
straight to the bottom of the cell. Columella indistinct. Five prin- 
cipal lamellee in half an inch. Height 14 lines; breadth 16 lines ; 
proportion of axes 7 : 16. 
Specimens in the British Museum are rather longer in proportion 
than those in my possession ; but the variation is not very great. 
Hab. Philippines. 
This coral is very neat and symmetrical, and can hardly be con- 
founded with any other species. 
2. FLABELLUM NOBILE. (PI. XXVIII. figs. 4, 5.) 
Much compressed throughout, elongated. Borders rather con- 
cave, with four or five root-like appendages more or less distant from 
the base, but closely united throughout their length to the lower 
half of the coral. These appendages spring from and are continuous 
with the transverse epithecal ridges which mark the successive | 
periods of increase in the coral, and, although now intimately united 
to the main stem, are evidently of extraneous growth, corresponding 
in origin and nature with the ordinary form of spines, but taking a 
downward direction to increase the basal area. Upper margin of 
the coral slightly arched. Cell very deep and narrow. Margin of 
lamelle entire, and gradually curving from apex to base, at which 
point opposite series of the larger plates almost unite. No colu- 
mella perceptible. Four principal lamellz in half an inch. 
The two specimens which have furnished the above description 
are of different ages. The smaller and more perfect example is at- 
tached to the upper margin of the flat side of the larger one, and has 
grown in nearly the same vertical direction. It measures 2 inches 
6 lines in height, and 1 inch 10 lines in greatest breadth. The older 
example is 2 inches 6 lines in the long diameter, and 1 inch 3 lines 
in the short. The base of this specimen is imperfect ; so that the 
original length of the coral cannot be certainly ascertained. 
This species is intermediate between the genera Flabellum and 
Rhizotrochus, having the usual compressed shape of the former, with 
a partial development of the radiciform appendages of the latter re- 
markable genus. The peculiar situation of the smaller specimen is 
perhaps worthy of notice, as being one in which the supplemental 
props are especially useful in aiding the attenuated base to support 
the long and heavy coral. A similar tendency to parasitic growth, 
