394 PEOCEEDINGS OF THE GEOLOGICAL SOCIETY. [April 5, 



decomposition ; but then the separated cells would be easily detected 

 by the microscope amid the dust, as they are now in nearly every 

 pinch of beach-sand from the beach which surrounds the Australian 

 shore. It would appear from this that GateniceUidm are peculiar to 

 the recent period. Yet some recent forms are represented at Mount 

 Gambler, as Mr. Busk has already pointed out. Among them are 

 Salicornaria sinuosa, Hassall; Crisia ehurnea, Johnst. ; Carbasea lata, 

 Busk ; Membranipora ctenostoma, Husk ; M. Cyclops, Busk ; M. bidens. 

 Hag. ; Idmonea Milneana, D'Orb. ; Metepora monilifera, Macgil. 

 Of these none exist at Hamilton except Scdicornaria sinuosa and 

 Membranipora cyclops. The former is a very common fossil at 

 Mount Gambler. Scarcely a fragment of the stone can be found, or 

 a cast of a fossil on which portions of its cylindrical branches cannot 

 be traced. At Hamilton it is not very common and is somewhat 

 distinct in character. It is larger than ordinary, and the reflected 

 margin round the mouth is much more clearly defined. The Mem- 

 branipora cyclops is very similar in character in both places, but 

 more rare at Hamilton. With reference to the extinct species, the 

 difference between the deposits may be thus described. At Mount 

 Gambler, as Mr. Busk has remarked, the Bryozoa are distinguished by 

 the peculiar and characteristic forms of the genus Cellepora. This 

 genus is rare at Hamilton, and the beds are, on the contrary, distin- 

 guished by the variety and peculiarity of the genus EscTiara. No less 

 than eleven different forms have been found by me, only three of which 

 can be referred to the Mount Gambler limestone. A peculiar form of 

 Cellepora in the latter, which has been named by Mr.Busk C. nummu- 

 laria, is perhaps found at Hamilton and Geelong, but so very much 

 larger in size that I fancy the species must be distinct. Melicerita 

 angustiloba, Busk, is found in both locahties, but more commonly at 

 Mount Gambler. Lunulites, which are pretty common at Hamilton^ are 

 rare in the limestones, and the species are different. Finally, all 

 the different species of Eschar a are of singular beauty in the forms 

 of their cells, while those of Mount Gambler are comparatively des- 

 titute of ornament. On the whole, the aspect of the Brj^ozoa at the 

 Mount is much the more modern of the two. 



Note on the Fossil Coeals from Mitddy and Yiolet Ceeeks, South 



Australia. By P. Maetin Duncan, M.B., Sec.G.S. 

 The Corals forwarded by the author of the preceding paper have 

 been described by me in the ' Annals of Natural Historj^ ' (No. 81, 

 Sept. 1864) ; they are solitary species and probably dwelt in deep 

 water from 80-120 fathoms. There are no reef or atoll species 

 amongst the collection, and the evidences of luxuriant coral growth 

 are deficient. 



List of the Species. 



1. Caryophyllia viola, o^ohis. \ 1 4. Placotroclius eloiigatiis, nobis. 

 Turbinolia viola, Woods, M.S. J | 5. Placotrochus deltoideus, nobis. 



2. Flabelliim Victorias, oiohis. 6. Balanopliyllia Australieusis, nobis. 



3. Flabellum Gambierense, nobis. \ 7. Trochoseris Woodsi, nobis. 



The condition of the specimens is pecuHar, most of them are glazed 

 externally, are very fragile, and present no evidences of mineraliza- 



