1870.] DUNCAN — AUSTRALIAN CORALS. 299
with elevations longitudinally. The calice is circular. The septa
are not exsert, and are unequal, short, not very straight, granular
and distant ; the cyclical arrangement is very irregular, and there
are three cycles in some systems, and part of a fourth in others.
The septa are alternately large and small, and there are twenty-eight
of them. The columella is large, and consists of several (twelve)
irregularly shaped papillose projections.
Height of the corallum 4/10 inch. Breadth of the calice 2/10 inch.
Locality. No 9, 3 miles west of the river Gellibrand.
9. Flabellum Victoriae, Duncan. Plate XIX. fig. 11.
The coral presents a large basilar erosion, the result of the breaking-off of the peduncle : it has a sharp lateral spine on either side, which projects outwards and downwards, and which is situate immediately above the erosion. The coral is tall, compressed more below than above ; its sides are slightly concave; and it is furnished with an epitheca which has faint transverse markings. The sides of the coral, where they are produced towards the attachment, would form an angle of about 20° ; they are rounded off, and only present the spine already noticed. The calice is elliptical ; the plane of the smaller axis is slightly higher than that of the larger ; the fossa is shallow, but centrally deep, narrow, and long, and the wall is thin. The septa are delicate, not exsert, are very slightly rounded, marked by large granules in series, and unequal ; there are four cycles, in six systems, the primary and secondary septa being equal. There is no columella. The intercostal spaces are developed into rounded ridges, and the septa are continuous with them.
Height 6/10 inch. Length of calice 5/10 inch. Breadth of calice 4/10 inch.
Locality. Muddy Creek, South Australia.
10. Flabellum: distinctum, Edw. & H. Plate XX. fig. 2.
The corallum is much compressed. The lateral costae are slightly convex, not almost horizontal, but slightly ascending, and furnished with strong crests inferiorly. The principal costae are distinct and broad, but very slightly prominent. The calice has a slightly convex margin ; the axes are as 100 to 240 ; the summits of the large axis are rounded, and are situated at the upper third of the corallum ; the fossule is narrow and very deep ; and the columella is quite rudimentary or does not exist. There are six systems of septa, and six cycles, in perfect specimens.
Localities. No 1, 1-1/2 mile west of Cape Otway, and No. 4, clay beneath " Coralline beds," Cape Otway. Recent in the Red Sea and Japan.
11. Flabellum gambierense, Duncan. Plate XIX. figs. 9 & 10.
The coral is tall, slightly or decidedly curved, has a long tapering pedicel, concave sides, and often small spines nearer the calice than the pedicel ; it is compressed, has a strong epitheca, whose folds are arched and finely linear, and a calice oval-elliptical in shape. The
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