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A law of acceleration, definite and constant as any law of mechanics, cannot be supposed to relax its energy to suit the convenience of man. No one is likely to suggest a theory that man's convenience had been consulted by Nature at any time, or that Nature has consulted the convenience of any of her creations, except perhaps the Terebratula.
But if Globigerinae, and Terebratula caput-serpentis and Beryx, not to mention other forms of animals and of plants, thus bridge over the interval between the present and the Mesozoic periods, is it possible that the majority of other living things underwent a "sea-change into something new and strange" all at once?
In this species are comprehended three Ascidiæ, of different forms; one Anomia, one Terebratula attached to a Fusus, two Lepas, and a Balanus. Six Holothuria, belonging to three different species, were observed: a large Thalassema gave us a long-wished for opportunity of observing, that this species belongs to the Holothuria, and not to the Annulides.
Terebratula aenigma, var. Spirifer Chilensis. Mingled together in alternating beds in the main valley of Copiapo near Las Amolanas, and likewise higher up the valley: Pecten Dufreynoyi. Turritella Andii. Terebratula aenigma, var. as at Guasco. Astarte Darwinii. Gryphaea Darwinii. Gryphaea nov. species? Perna Americana. Avicula, nov. species. Pecten Dufreynoyi. Gryphaea Darwinii?
Finding himself at a loss for some single figure to illustrate the Law of Natural Selection, Adams asked Sir Charles for the simplest case of uniformity on record. Much to his surprise Sir Charles told him that certain forms, like Terebratula, appeared to be identical from the beginning to the end of geological time.
This latter group constitutes the larger part of the Carboniferous Mollusca, 157 species being known in Great Britain alone, and it will be found to increase in importance in the fauna of the primary rocks the lower we descend in the series. Terebratula hastata, Sowerby, with radiating bands of colour. Mountain Limestone. Aviculopecten sublobatus, Phill. Mountain Limestone.
Judd remarks that as Ammonites clypei-formis and Terebratula hippopus characterise the Middle Neocomian of the Continent, it is to this stage that the Tealby series containing the same fossils may be assigned.
"The fawn-coloured fossils from his coralline limestone are evidently the same as those of the tertiary formation along the south-east coast of Arabia, and therefore the same as those of Cutch; and it is exceedingly interesting to find that among the blue-coloured fossils which are accompanied by specimens of the blue shale, composing the beds from which they have been weathered out, are species of Terebratula Belemnites, identical with those figured in Grant's Geology of Cutch; thus enabling us to extend those beds of the Jurassic formation which exist in Cutch, and along the south-eastern coast of Arabia, across to Africa."
In Siluria, he understood, Sir Roderick Murchison called the horseshoe a Limulus , which helped nothing. Neither in the Limulus nor in the Terebratula , nor in the Cestracion Philippi ,any more than in the Pteraspis, could one conceive an ancestor, but, if one must, the choice mattered little. Cousinship had limits but no one knew enough to fix them.
Time and patience were the remedies. The shock of this discovery to his financial principles was serious; much more serious than the shock of the Terebratula and Pteraspis to his principles of geology. A mistake about Evolution was not fatal; a mistake about specie payments would destroy forever the last hope of employment in State Street.
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