1(39 
C/rtS5— POLYPI. 
Orf^e;— ZOANTHARIA. 
Section—'RUGOSA. 
Genus — AXOPHYLLUM, 3Iilne Edwards and J. Raime. 
Axophyllum ? Tkomsoni, L. G. de Koninck. 
PI. V, Pig. 8. 
Corallum simple, cyliuclro-conical, slightly curved, enclosed hy a thin 
epitheca, showing faint lines of growth. The calice is suh-circular ; columella 
well defined, laterally eompressed, and oval in section. The primary septa 
numher forty-fonr, tliey are rather thick in the middle and thin out towards 
the centre of the ealice, and slightly fiend hack on themselves before reaching 
the columella. The primary septa, alternate with an equal numher of second- 
ary septa only one-third as long, of which the greater numher, bending 
themselves slightly towards the primary septa, become united to them hy 
their internal extremities. The interseptal loculi are filled with dissepiments 
extending inw^ards from the marginal circumference for about two milli- 
metres. The fossula is not well-developed, and is situated on the concave 
side of the corallum. 
Dimensions. — I have had at my disposal only one very imperfect frag- 
ment of this species, the length of which is probably from five to six centi- 
metres. The diameter of the calice is about twenty-tliree millimetres. 
Distinguishing Characteristics . — By its relatively more elongated, more 
curved, and less turbinated form, and hy the union of tlic secondary with the 
primary septa, this species may easily he distinguished from all others yet 
known. 
In dedicating it to Mr. James Thomson, of Glasgow, I pay a tribute 
of respect to the remarkable talent displayed by that gentleman in his exami- 
nation of the Carboniferous corals of Britain, the study of which was entrusted 
to him hy the British Association for the Advancement of Science, and thank 
him for his extreme kindness in examining the Australian species mentioned 
in this work. The chief part of my descriptions of these is derived from notes 
he kindly transmitted to me. 
