300 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Feb. 9,
septa are in six systems of four cycles : the primary and secondary
are equal, stout, granular, and enlarged internally, where their ends
form a rudimentary parietal columella ; the other septa are smaller
and granular. The costae are represented by depressions, and the
intercostal spaces by rounded elevations, which are marked by chevron
markings of the epitheca. The septa are continuous with the depressions
between the " intercostal spaces," which may be regarded
more or less as costae.
Height of the coral 8/10 inch. Length of calice 4/10 inch. Width of calice 3/10 inch.
Localities. Tertiaries of Mount Gambier, South Australia, and No. 4, clay beneath " Coralline beds," near Cape Otway, Victoria, S. Australia.
12. Flabellum Candeanum, Edw. & H. Plate XX. fig. 1.
Locality. Murray Tertiaries. No. 9, 3 miles west of the river Gellibrand
13. Placotrochus elongatus, Duncan. Plate XX. fig. 3.
The coral is very tall in relation to its breadth, straight, greatly compressed, especially inferiorly, finely pedicellate and cuneiform. The sides are rounded, and slightly swollen out here and there, and form an angle of about 15°-20°, or are sharp and slightly spined ; but the spines do not project much beyond the epitheca (in old specimens). The anterior and posterior surfaces are flat. The calice is small, elliptical, and rounded at the sides ; it has slightly exsert septa, which are rounded, thin, delicate, unequal, and in six systems of four cycles. The fossa is central, shallow, and long ; the columella projects from the bottom of it as a distinct, straight lamella. The columella is stout in the body of the coral, and is thinner at its free edge ; laterally it is marked by distinct papillae, which mark the junction of the principal septa ; and it is " essential." The lamellae of the septa are delicate, highly granular, and are often wavy at the inner margin. The smaller axis of the calice is slightly higher than the longer. The costae are faintly marked, or distinct and linear. The epitheca is in strong curved folds, often as festoons between the costae.
Height 8/10 inch. Length of calice 3/10 inch. Breadth of calice 2/10 inch.
Localities. Muddy Creek, South Australia, and No. 4, clay beneath " Coralline beds," South Australia.
14. Placotrochus deltoideus, Duncan. Plate XX. fig. 4.
The corallum is deltoid, finely pedicellate inferiorly, and compressed. Superiorly the calice is wide and long. The costae are moderately distinct. The epitheca is strong, and presents arched ridges, the costae being often chevroned beneath it. The columella is long, sharp, thin, and faintly papillate. The septa are not exsert, are feebly arched and delicate, granular, and their internal
