Development of Bilobites

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Abstract
THE Linnean species so well known under the name of Orilds biloba, and so widely distributed in the Sil1ll'ian rocks of the world, represents one of the vel'y distinct members into which the Orthis gronp is now divided.It is much removed from ordinary Orthis in general extel'llal features, and only by means of developmental chal'acters is it possible to arrive at any idea of its genetic history.After having been referred to various genel'a, including Anomia, Terebratula, Delthyris, and Spi1'ifcr, by different authors prior to l8-1:8, Davidson* first showed conclusively, from a study of the internal characters, that the tl'Ue relations were' with the gerllls Orthis.Its position has since remained unchallenged, and subsequent investigation has not bronght forth any new characters, nor invalidated the results obtained by Davidson.The additional observations here made concerning the development of the shell, while adding to onr knowledge of the species, merely serve to bind more closely this forlll to the group-having the broad designation of Orthis.Prof.King in 1850t proposed the genus Diemlosia for this species,
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Authors C. E. Beecher
Journal american journal of science
Year 1891
DOI
10.2475/ajs.s3-42.247.51
URL
https://doi.org/10.2475/ajs.s3-42.247.51
Keywords Keywords not found

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