168 PERMIAN FOSSILS. 



in the deep sinus of the wing-area. " The line of separation" noticed is not so prominent 

 on the under or small valve. The hinge-area possesses six or more cartilage-pits. It 

 is a beautifully striated species. The Carboniferous Gervillia laminosa, Phillips, appears 

 to be an allied form. 



Bakevellia ceratophaga occurs rather rarely in the Shell-limestone of Humbleton 

 Quarry and Tunstall Hill. It has been noticed in a locality one mile north-west of 

 Pontefract. The Doggerbank fragment of Limestone contained a single specimen. 

 Another specimen occurred to me in the Breccia of Tynemouth Cliff. Dr. Geinitz 

 having confounded this species with the following one, it is difficult to speak precisely 

 as to its German habitats : probably both species agree in this respect : the following 

 localities from the ' Versteinerungen' (p. 10) are therefore given on this supposition: 

 "rarely in the under Zechstein of Corbusen, Duchy of Altenberg; in the Lime- 

 stone between the Weissliegenden and Kupferschiefer, also in the Zechstein of 

 Kamsdorf and Seissla near Konitz ; in the upper Zechstein of Roschiitz near Gera, 

 Herges in the Schmalkalden province, Hirschberg near Asbach, between Allendorf and 

 Zizzendorf; in Dolomite near Poessneck, Konitz,' and Gliicksbrunn in Thuringia. 

 According to Beyrich, in Schlesien." Fossils, which Count Miinster has identified 

 with the present species, occur in the Trias (?) rocks of St. Kassian. 



Bakevellia anttqua, Miinster, Plate XIV. figs. 28, 29, 30, 31, 32, 33, 34. 



AvicuLA ANTiQUA, Munsler. Goldfuss, Petrefacta, part ii, p. 126, pi. cxvi, fig. 7 a, b. 

 (?) A SPECIES OF AviCTJLA,2 MtircMson. Silurian System, p. 50, 1839. 



AvicuLA INFLATA, Browti. Trans. Manch. Geol. Soc, vol. i, p. 65, pi. vi, figs. 25, 26, 1841. 



— BiNNEYi „ Op. cit., p. 65, pi. vi, fig. 27. 



— DiscoBS „ Op. cit., p. 65, pi. vi, fig. 28. 



Last three synonyms, Brown. Brown's Fossil Concliology, pi. ixvi**, figs. 3-8, 1843 

 Do. „ Morris, Catalogue, p. 106, 1843. 



Do. „ De Verneuil, Bull. Soc. Geol. de France, 2™^ serie, t. i, 



p. 33, 1844. 

 AvicuLA ANTIQUA, Munst. Loc. cit. 



— — „ Geol. Russ., vol. i, p. 224; vol. ii, pp. 319-20, pi. xx, fig. 



13 «, b, 1845. 

 Capt. Brown's three synonyms. Loc. cit. 

 AvicuLA ANTIQUA, Miiust. Kcyserling, Petschora-Iand, p. 250, 1846. 



— — „ Tennant, Strat. List, p. 88, 1847. 

 Capt. Brown's three synonyms. Loc. cit. 

 Bakevellia antiqua, Miinster. King, Catalogue, p. 10, 1848. 



AvicuLA — „ Howse, Trans., T. N. F. C, vol. i, p. 249, 1848. 



Gervillia keratophaga, Schlotheim. Geinitz, Versteinerungen, p. 10 Q.partim), 1848. 



^ I collected specimens of Bakevellia ceratophaga at Schlossberg von Konitz. 



2 " A species of Avicula not very remote from the A. socialis of Schl. occurs in the Magfiesian Marls at 

 CoUyhurst, near Manchester." (Op. cit.) 



