ON SOME AUSTRALIAN TERTIARY CORALS. 183 
PracorRocnus ELEGANS.—Corallum, minute, broadly wedge- 
shaped, laterally compressed, elliptical, major axis of summit 
i e bas t L 
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the centre, leaving a deep fossa in which se sg sien ig 
is very a Nagios —, t does not & e to the level of ~ 
tg Alt., . axis, 3, cH 7 diem. of 5 2 
(Plate Z 7 lan d fig. la.) ‘ 
Genus Spuenorrocuvs. Mil. Ed. § H., 1848. 
Corallum, simple, free, without trace of adherence, poi and 
cuneiform ; columella and septa like Placotrochus ; 
costee pansailty distinct and simple, granular, or cris’ 
PHENOTROCHUS — RIS, N.S. C ralla ae, wedge-shaped, 
The section of the su oe ee elli ee the major axis being 
more than twice the diameter of the mmor. There are 
whole poh a 
ture of i rregular papille and pores. The ealice is deep, an 
lower at both ends. Septa in six systems of three cycla, the 
uniting with it simply. All the lamine granular, and diy 
granules arranged at the exsert rounded edges of the primarie 
radiating lines. Alt., 9; maj. axis, 7; min.,3. Not ve pa ols 
This fossil derives ‘speeial i interest from the fact that it still 
exists on the east coast, some fine specimens having been 
remar t the Sp 
prc llary peculiar to the aa formation, 
while of the ies which have smooth cost one belongs to the 
resent period, three Miocene, only one in the older 
T has the coste distinet and papillary in the young 
state, but as it Ider the Il 
pore yrds vormeate hen” (Bate I, fig. 4.) 
