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Sentences for "bivalves "
Those succulent bivalves may help us and the truffles of Perigord, tubers dislodged through mister omnivorous porker, were unsurpassed in cases of nervous debility or viragitis.
Amongst the Bivalves we may note the great abundance of Scallops (Aviculopecten and other allied forms), together with numerous other types-some of ancient origin, others represented here for the first time.
The principal Permian Bivalves belong to the groups of the Pearl Oysters (Aviculidœ) and the Trigoniadœ, represented by genera such as Bakewellia and Schizodus, the true Mussels (Mytilidœ), represented by species which have been referred to Mytilus itself, and the Arks (Arcadœ), represented by species of the genera Arca (fig.
The most characteristic fossils which they contain are the three Bivalves Cardium Rhœticum, Avicula contorta, and Pecten Valoniensis, but they have yielded many other fossils, amongst which the most important are the remains of Fishes and small Mammals (Microlestes).
Amongst the Bivalves we find the Palæozoic Megalodon side by side with the Triassic Halobia and Myophoria, these being associated with the Carditœ, Hinnites, Plicatulœ, and Trigoniœ of later deposits.
The predominant Bivalves of the Jurassic, however, are the Oysters, which occur under many forms, and often in vast numbers, particular species being commonly restricted to particular horizons.
In the great river-deposit of the Wealden, the Bivalves are forms proper to fresh water, belonging to the existing River-mussels (Unio), Cyrena and Cyclas, but most of the Cretaceous Lamellibranchs are marine.
It is difficult to make any selection from the many Bivalves which are known in deposits of this age, but species of Cardita, Crassatella, Leda, Cyrena, Mactra, Cardium, Psammobia, &c.
Amongst the Mollusca, those Bivalves which possess breathing-tubes (the "siphonate" Bivalves) are generally admitted to be higher than those which are destitute of these organs (the "asiphonate" Bivalves), and the latter are especially characteristic of the Palæozoic period, whilst the former abound in Mesozoic and Kainozoic formations.
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