308 PROCEEDINGS OF THE GEOLOGICAL SOCIETY. [Feb. 9, 
The only Sicilian species is Conotrochus typus, Seg., a most variable 
form. M. Seguenza sent me a collection of specimens of the species, 
and there has been no difficulty in determining the specific identity 
of the Australian and Sicilian forms. The second, Australian species, 
Conotrochus M‘Coyt, differs from Conotrochus typus in the stoutness 
of its epitheca, in its form, and in its small calice and columella. 
The genus is not represented in the recent coral faunas or in any 
strata except the Sicilian marl and the Australian Cainozoic. 
The four species of the genus Jabellum found in the Australian 
tertiary deposits are very remarkable. Two of them are peculiar to 
the strata, and the others are well-known in the faunas of the Red 
Sea and the China and Japan seas. The genus is large, and numbers 
about fifty species, which are divided into those with a very small 
pedicel, those with a large base which was once attached (truncata), 
those always adherent by a large base, and those haying root-like 
processes of epitheca. 
The species hitherto recognized in the fossil condition belong to 
the first division ; butin the Australian Tertiaries two of the truncate 
forms are found. 
The recent species are found especially in the great Coral ocean 
between the east coast of Africa and the west coast of America. 
Many are found in the Red Sea, and in the Chinese and Japanese seas ; 
and one exists off the coast of New Zealand. None have been found 
in the West-Indian seas; but a degenerate form lives in the North 
Sea, the Bay of Biscay, and probably in the Mediterranean. The 
truncate division contains many species; and those whose localities 
are known range from China, the Philippines, and Indian Ocean to 
the Australian coast near Hardy Island. The division with a small 
pedicel had a species in the Lower Chalk, many in the Eocene of 
Europe and America, and a considerable number in the Miocene and 
Pliocene deposits of Europe. The species found in the Miocene of 
the West Indies were two in number only. 
Flabellum distinctum, which is found in two of the beds near Cape 
Otway, is a well-known form in the Red Sea and off the coast of 
Japan. With Flabellum pavoninum, Lesson, of Singapore and China, 
F’, extensum, Michel., found in the European Miocene and, probably, 
Oligocene strata, 1. intermedium, Edw. & H., from the Miocene of 
Tortona, and F. Basterott, Edw. & H., of the Faluns, the Flabellum 
distinctum forms a series of very indistinctly separable species. They 
are all probably varieties of an early type, and are not worthy of 
the title of separate species. Finding the so-called species F. di- 
stinctum in the Cainozoic of Australia, and in the sea to the north- 
east, does not interfere with the belief that all the forms just men- 
tioned have lasted, interrupted only by slight variation, from the 
Oligocene up to the present time. 
Flabellum gambierense is a pedicellate form. During its youth 
it has no spines, and is almost clavyiform ; but with age it grows tall 
and curved, and throws forth curiously twisted processes of epitheca. 
It is not like any other Flabellum. Flabellum Candeanuwm and F. 
Victorie are the fossil truncate species. The first is found in the 
