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 54; inch. Breadth of the calice 2, inch. 
Locality. No 9, 3 miles west of the river Gellibrand. 
9. Frasettum Victoria, 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 {5 inch. Length of calice =3, inch. Breadth of calice 54, 
inch. 
Locality. Muddy Creek, South Australia. 
10. FuaBeLivm pistrnctum, Edw. & H. Plate XX. fig. 2. 
The corallum is much compressed. The lateral costz are slightly 
convex, not almost horizontal, but slightly ascending, and fur- 
nished with strong crests inferiorly. The principal coste are dis- 
tinct 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 colu- 
mella is quite rudimentary or does not exist. There are six systems 
of septa, and six cycles, in perfect specimens. 
Localities. No 1,13 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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