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Published online by Cambridge University Press: 01 May 2009
Dr. Duncan'S researches on the Palæontology of the West Indies have so much enhanced the value of any fossils found in those islands, that I do not hesitate to make a few remarks on some Orbitoides contained in a piece of Antiguan ‘Chert’, given many years ago, by Dr. Nugent, to the Geological Society, and to which Mr. H. M. Jenkins, Assistant-Secretary G.S., some months since directed my attention; and also on some specimens of fossiliferous flint and limestone from Jamaica.
page 102 note * De Fromentel, E., Polyp. Foss., p. 232;Google Scholar and Reuss, , Corals, Gosau, Trans. Acad. Vienna, vol. vii, 1854.Google Scholar
page 102 note † Labelled' “Flint out of Marl”, Dr , Nugent, 15, 526.’Google Scholar
page 102 note ‡ Like some from South Australia in this respect. These, like other siliceous bands and nodules, have the appearance of being so much calcareous matter more or less perfectly converted into flint, which, at its outer limit, imperfectly replacing the particles of the chalk, marl, or shell-mass, ends with a rough surface.
page 103 note * See Dr , carpenter's ‘Introd. Study Foram.’ (Ray Soc.), 1862, p. 298.Google Scholar
page 103 note † The network of the weathered Orbitoides first attracted attention as somewhat resembling Bryozoan structure.
page 103 note ‡ As in Nummulina, so also in Orbitoides, there may be seen individuals that, commencing with a relatively large central or first chamber, never attain a large discoidal growth, whereas others that begin with a small primordial chamber have a very much greater peripheral development.
page 104 note * In the ‘Geologist,’ vol. vii. p. 134,Google Scholar I stated that Operculinœ occur in the Maltese limestone containing Orbitoides; but the majority of what I there referred to as two sub-varieties of Operculina complanata, Defrance sp., are certainly Heterosteginœ and those in another hand-specimen, not now in my possession, may also prove to be Heterosteginœ. I have lately seen fine specimens of Heterostegina-limestone from Crete, in Capt, Spratt's collection.
page 104 note † The subject of a Note communicated to the Geological Society last year; but at that time I had not recognized the presence of O. Mantelli in this limestone. See Quart. Journ. Geol. Soc., vol. xix. p. 514.Google Scholar
page 104 note ‡ Presented to the Geological Society by Mr. Thomas Bland, F.G.S.
page 104 note § Other Tertiary specimens from Jamaica, lately submitted to me by MrWall, G. P., are:—Orbitoidal limestone, Hopewell, , Metcalfe, ;Google Scholar Flint with Orbitoides and Nummutinæ, River, Orange, Metcalfe, ;Google Scholar Limestone, with Operculinæ and Nummulinæ, and the same semi-silieified, Hall, Brimmer, St. Mary, ;Google Scholar Flint with Operculinæ and Nummulinæ, Preston, St. Mary, ;Google Scholar limestone, Orbitoidal Hall, Carron St. Mary;, Alveolina-limestone, Crofts, Clarendon, ; and Orbitolina-rock, Vere; besides shelly and oolitic limestones from Thompson Town and Upper Clarendon.Google Scholar
page 105 note * Quart. Journ. Geol. Soc., vol. xix. p. 510.Google Scholar
page 105 note † See Lyell on the Orbitoidal Limestone of Alabama; Quart. Journ. Geol. Soc., vol. iv. p. 10, 1847.Google Scholar
page 105 note ‡ Geological Magazine, No. 2, p. 75.Google Scholar
page 105 note § I have some polished pieces of limestone in which largish Nummulinm accompany Orbitoides; but I do not know whether they are from Europe or India; probably, I think from the latter.
