192 ON SOME AUSTRALIAN TERTIARY CORALS. 
lobes. Costx visible to the base, rounded, straight, sharp, and 
roughly _dhpetges in four cycla, and eorresponding to the septa, 
primaries, and secondaries, arising from the base ; tertiaries almost 
urth a 
immediately above ; fo nd fifth orders, a fourth of the height , 
om the base. Intercostal grooves rather wider than coste, and 
showing at the edge a very thin wall. Alt., 10 to 12; maj. 
iam., 73 to9; min., 53 to 7 millim. In young specimens eee 
A miliim) the columella is not distinguishable, ‘and the pali are 
rudimentary like twisted laminz before the first three orders. 
The Italics ion where my diagnosis differs from Prof. Dun- 
ean’s. (Plate IJ, fig. 3.) 
Derrocyatuts Excisus (Sphenotrochus excisus, Dunca 
a Jour. Geol. Soc., 1870, x 298). aie couaniile 
ase Wi notch, the hie being p stneged into acute 
short points ; broadly elliptical; cost few, broad, flat, 
finely granular, persistent from edge o e to the base, and 
regularly alternating with the septa ; intercostal spaces regularly 
subspinously granular. Septa usually in six sy ree 
eycla, ar angen with one system aborted as in the — not 
common ; primaries an es equal, vers much e 
inguishable from the paliin the centre. Calicular fossa, shallow. 
Alt., 10; maj. axis of calice, 54; min. axis, 4;, height of exsert 
: Ge al. Soe. os cit. ‘Sphenotrochus excisus. e coral is ie — 
pressed, especially saa where two lateral processes gi 
notched or emarginate appearance to the base. "Superiony a 
relation of the long to the short = is =~ 2to1. The coral is short 
and broad, the base is nearly as as the calice is lo 
ar margin. ce 
The columella is not long, and from being joined to the: 
primary — 
and socom Mad septa by processes which are > rounded above is 
* 
