from the South-Australian Tertiaries. 167 
without epitheca. The species P. alveolus (nobis), from the 
West-Indian Miocene, is unique. 
The first species of the genus were described by MM. Milne. 
Edwards and Jules Haime*—the P. levis of the Philippines 
and P. Candeanus of the Chinese seas. The next species were 
described in my Essay on the Fossil Corals of the West-Indian 
Islandst. The P. Lonsdalei resembles the Flabellum avicula in 
many respects; but the P. alveolus is unlike any other species 
m its general shape. Lately some fossils from the Jamaica 
Miocene have been described by me; but they are not yet pub- 
lished: amongst them are P. costatus and the Flabellum which 
is mimetic—the Flabellum exaratum, Dunc. MSS. The group 
then stands as follows, with its mimetic Flabella :— 
Pedicellate Placotrochi. Pedicellate Flabella. 
Placotrochus Lonsdalei, Dune. Flabellum avicula, Mich., sp. 
deltoideus, n. sp. Siciliense, #. § H. 
elongatus, n. sp. cuneiforme, Lonsdale. 
Truncate Placotrochi. Truncate Flabella. 
Placotrochus Candeanus, Z. § H. | Flabellum compressum, Lamk.,sp. 
levis, L. § H. crenulatum, 2. & H. 
Placotrochus without epitheca. Flabellum without epitheca, 
Placotrochus costatus, n. sp. Flabellum exaratum, n. sp. 
Anomalous. 
Placotrochus alveolus, Dune. 
The truncate Flabella are all recent, except in the instance 
now noticed ; and, until the discovery of Placotrochus Candeanus 
in the Muddy Creek, the truncate Placotrochi were the recent 
forms: all the others belong to the Miocene age. There is no 
more than a generic relation between the West-Indian and the 
Australian Tertiary Placotrochi. 
The new Balanophylia has only a generic affinity with B. 
Cumingui, EK. & H., of the Philippines, and is more closely allied 
to the B. prelonga, Michel., sp., of the Turin Miocene : it belongs 
to the same section of the genus as the Italian form, and they 
have several peculiarities in common. The new species is no- 
thing like our Crag species. 
The Trochoseris Woodsi has only a generic affinity with the 
T. Stokesi, EK. & H., from the Philippimes, and is very distinct 
from the Hocene forms. 
Cellepora Gambierensis, Busk, is a characteristic fossil of the 
‘Mount-Gambier Tertiaries. 
* Hist. Nat. des Corall. vol. ii. p. 98. 
+ Quart. Journ. Geol. Soc. vol. xix. 
