26 CARBONIFEROUS LAMELLIBRANCHIATA. 



and it is impossible now to judge from the original specimen, as the pen which 

 gave that specimen the sinus has probably left scratches in the supposed 

 situation. 



In the same volume the genus Edmondia, de KonincJc, is re-defined, and some 

 internal characters of that genus described and figured, the type taken being from 

 the Redesdale Ironstone beds of Lower Carboniferous age. Other than these two 

 cases no further mention is made in the work of Carboniferous remains. 



In 1849 Captain Thomas Brown issued his ' Atlas of the Fossil Conchology of 

 Great Britain and Ireland,' a work in which were reproduced the figures of all the 

 fossil Mollusca hitherto published in Great Britain. Several new Lamellibranchs 

 from the Coal-measures are described in the volume, but curiously enough none 

 of M'Coy's new genera or species seem to have been known to the author. A 

 brief description and the locality of each fossil are also given. The publishers 

 brought out a reproduction of the plates of this work with a much abbreviated 

 letterpress in 1889, and, unfortunately, adopted none of the revised generic names 

 which had come into vogue in the interval between the editions. The plates are, 

 however, from the same steel plates, and are therefore identical with those of the 

 original. 



1850. D'Orbigny's 'Prodrome de Paleontologie ' bears the date 1850, but all 

 species given on his authority are dated 1847. 282 species of Lamellibranchs 

 from Carboniferous strata belonging to nineteen genera are enumerated with 

 reference to the author of each and the locality where it occurs. 



1851. In the 'Annals and Magazine of Natural History' for the year, sec. ii, 

 vol. vii, p. 157, is a paper by M'Coy entitled "Description of some New 

 Mountain Limestone Fossils," with a full account of his new genera, Streblopteria 

 and Aviculopecten, and a figure of the internal cast of a member of the latter ; 

 and two years later, in 1853, in the same serial is another paper, " On some New 

 Carboniferous Limestone Fossils," with descriptions of four new shells. This 

 description was literally repeated with figures in that author's greater work 

 published in 1854-6 in conjunction with Adam Sedgwick, entitled ' British 

 Palseozoic Fossils.' This is a great work, containing much new matter as to 

 classification, several new orders and families being defined, and many old 

 families, genera, and species being re-described. Figures are given of the New 

 Carboniferous fossils described in the ' Annals and Magazine of Natural History ' 

 for 1851, just quoted, together with others, — in all twenty species belonging to 

 seven genera ; but no new form is described in the work. 



In the plates to this volume the lithographer has not reversed the drawings on 

 the stone, so that the opposite valve is apparently shown to that from which the 

 drawing was made. 



The following genera and species are figured : 



