58 
Height, 2 mm. ; length of calice, 4 mm. ; breadth of calice, 
3mm. The base is 2 mm. long and 1:5 mm. broad. 
Locality, etc.—The only example of this small coral was 
collected in the upper Eocene at Spring Creek by Mr. A. E. 
Kitson. Until other specimens come to hand, its generic 
position is queried. In several respects it closely resembles 
Discotrochus Duncani, Reuss, from the Miocene of Austro- 
Hungary.* Its septa and coste are arranged on the same 
plan even to the fine ridges in the intercostal furrows. It 
also agrees in size, though it differs slightly in shape. 
GENUS TROCHOCYATHUS. 
Trochocyathus Wilkinsoni, spec. nor. Pl. xxiii., figs. 4a, b. 
The corallum is turbinate, slightly curved, and expands 
regularly from the short, contracted, pedicellate base to a 
widely open calice. Тһе coste are continuations of the septa, 
and consist of subequal, prominent, granulate ridges, which 
are separated by corresponding interspaces. An epitheca, 
very delicate superiorly, but gradually becoming denser to- 
wards the base, covers both the coste and their interspaces. 
The wall is stout, especially inferiorly. 
The calice is shallow and slightly elliptical, with its major 
and minor axes in the ratio of 100 to 82. Тһе septa are in 
six systems with five cycles. Their margins and sides are 
beset with sharply pointed granules. The primaries and 
secondaries are moderately stout and subequal; the remain- 
ing orders diminish gradually in size. The quaternaries in 
each system unite with the enclosed tertiary, either on the 
surface or just below it, and from a half to two-thirds from 
the wall. The quinaries are rarely developed in both halves 
of the systems, and may be entirely absent in a 
whole system ; when present, they fuse with the enclosed 
quaternary at about one-fourth from the wall. The pali 
are in two crowns, elongate, granular, irregular in shape, 
and placed before the first three orders of septa, the tertiary 
pali being much larger than the rest. The columella is fas- 
cicular, with a papillary surface, and fills the central fossa. 
The papilli present a confused appearance, and are not easily 
separable from the smaller, more central pali. Тһе calice 
of this species much resembles that of T. Victoria, Duncan, 
but has an additional cycle of septa in some systems and a 
larger columella. The pali are similar in appearance, and 
in both species are really enlargements of the septal ends. 
Such corals are by authors generally placed in Trochocy- 
athus. 
* Op. dU, p. 29, pl. iii., fig. 18, and pl. ivi; Mos. 102, 
