1886. | MADREPORARIAN CORAL. 129 
there was no trace of any shell or other foreign body to be detected 
as was the case with two other species of the same genus as described 
by Prof. Moseley (1, page 154). From the pedicel radiate cost corre- 
sponding to the primary, secondary, and tertiary septa. The cost 
are formed by ridges along which are a series of blunt points. 
Between the basal costze the corallum is granulated, the granules 
running in lines and corresponding, not to the septa, but to the 
interstices between them. 
On the side-wall of the corallum, however, the ridges and points 
become much sharper, and there arise costee corresponding to the 
quaternary and quinary septa; these are smooth and do not bear 
the points with which the primary, secondary, and tertiary coste 
are provided. 
The single specimen from which this species is described has 
unfortunately been broken and has re-mended itself, so that it is 
malformed, for there are only nine larger septa (7. e. primary and 
secondary) ; no doubt had the specimen been an uninjured one it 
would have possessed the typical Madreporarian number of twelve 
(i. e. six primary and six secondary ). 
The coral will therefore be described on this assumption. There 
are five cycles of septa—six primary, six secondary, twelve tertiary, 
and forty-eight quinary, in all ninety-six. 
The secondary septa are distinguished from the primary by 
bearing large stout pallial elevations, each septum bearing two, the 
smaller one being the more central; the primary septa also bear 
pali, but they are not so large or distinct as those of the secondary 
septa. The tertiary septa are also slightly thickened at their inner 
ends. 
The ends of the primary, secondary, and tertiary septa are all 
fused with avery thick up-rising of calcareous matter, the columella, 
which bears five or six rounded projections resembling the true pali, 
but much lower, showing how the columella has been formed by 
the central ends of the septa and their pali. This knobby top of 
the columella forms a floor to the central part of the enteron of the 
polype, and it is much shallower than the surrounding chambers 
between the septa, where the floor is formed by the true base of the 
corallum. 
The quaternary septa do not quite reach the columella, but they 
are bent inwards so as to touch the tertiaries ; those lying to the 
immediate left of the tertiary septum being shorter and joining the 
tertiary septum at a point nearer the circumference than those on 
the right, as is best seen in the figure (Plate XII. fig. 1). 
The quinary septa are much shorter than the others, only reaching 
halfway along the base of the theca and ending in two small 
upgrowths which seem to represent two rudimentary pali; no 
rudiments of pali could be seen on the quaternaries. 
All the septa are extremely exsert, the primary and secondary 
septa more especially so, so that in the specimen the tissues did not 
cover their sharp edges; but this is probably due to the contraction 
caused by the spirit. 
It is only the outer halves of the primary and secondary septa 
Proc. Zoot. Soc.—1886, No. IX. 
