58 Proceedings of the Royal Physical Society. 



British Carboniferous Univalves are the writings of M'Coy 

 already mentioned, Phillips' work on the Carboniferous Lime- 

 stone Fauna of Yorkshire, and Prof. L. Gr. de Koninck's Descrip- 

 tion des Animaiix Fossiles, &c.* In this work full descriptions 

 and good figures may be found of a large number of the Uni- 

 valve shells common to the Carboniferous rocks of Great 

 Britain and Belgium. Quite recently a magnificent book has 

 appeared from the pen of the same author on the Gasteropoda 

 of the Belgian Carboniferous Limestone. This important 

 addition is comprised in two folio volumes, text and plates. 

 It is entitled Fatme du Calcaire Carhonifere de la Belgique^ 

 ome partie, Gasterojoodes, and forms a portion of the sixth 

 volume of the Annates du Musee Eoyal d'Histoire Naturelle de 

 Belgique. Prof, de Koninck has thoroughly revised the 

 genera to which our Carboniferous Univalves should be 

 referred. In so doing he has conferred an inestimable 

 benefit on practical workers in Carboniferous Palaeontology, 

 but has, at the same time, greatly complicated the subject 

 by the description of what appears to us an inordinate 

 number of species. The genera met with in the Carboni- 

 ferous deposits of Scotland amount to about twenty, and are 

 represented by a large number of species. They are almost 

 wholly confined to the Upper and Lower Limestone Groups, 

 sparingly in the Millstone Grit, just represented in the Coal 

 Measures, but largely so in some areas of the Calciferous 

 Sandstone series, particularly that of Fife. 



As a group the Gasteropoda are not numerously repre- 

 sented in any of the beds,-|- but they are plentiful in some 

 districts; for instance, Mr Young informs us that around 

 Campsie alone twelve genera and forty species may be met 

 with. + 



With the exception of two all the genera belong to the order 

 Prosobranchiata. The two exceptions are Bellerophon and 

 Porcellia, which are usually regarded as Heteropods. The 

 I^ulmonata, or those Univalves breathing air, are, so far as 



* 4to, liiege, 1842-44, and Suppl id. 1851. 

 + Armstrong and Young, Catalogue, p. 55. 



X "On the Gasteropod Mollusca of the Carboniferous Limestone of the 

 AV. of Scotland" (Proc. Nat. Hist. Soc, Glasgow, 1863, i., p. 70). 



