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 Gervilia 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 Roschtitz 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 Minster has identified 
with the present species, occur in the Trias (?) rocks of St. Kassian. 
BAKEVELLIA ANTIQUA, Jhinster, Plate XIV. figs. 28, 29, 30, 31, 32, 33, 34. 
AVICULA ANTIQUA, Miinster. Goldfuss, Petrefacta, part ii, p. 126, pl. exvi, fig. 7a, 6. 
(2) A spnctus or AvicuLa,? Murchison. Silurian System, p. 50, 1839. 
AVICULA INFLATA, Brown. Trans. Manch. Geol. Soc., vol. i, p. 65, pl. vi, figs. 25, 26, 1841. 
— Brnnzeyr ,, Op. cit., p. 65, pl. vi, fig. 27. 
— DISCORS).11,5).) Op: cit... 00, pl-wvij,ie 28. 
LAsT THREE SYNONYMS, Brown. Brown’s Fossil Conchology, pl. lxvi**, figs. 3-8, 1843 
Do. 3 Morris, Catalogue, p. 106, 1843. 
Do. a De Verneuil, Bull. Soc. Géol. de France, 2™° série, t. i, 
p. 33, 1844. 
AVICULA ANTIQUA, Miinst. Loe. cit. 
— — » Geol. Russ., vol. i, p. 224; vol. ii, pp. 319-20, pl. xx, fig. 
13 a, 6, 1845. 
Cart. BROWN’s THREE SYNONYMS. Loc. cit. 
AVICULA ANTIQUA, Miinst. Keyserling, Petschora-land, p. 250, 1846. 
a — 3 Tennant, Strat. List, p. 88, 1847. 
Capt. BROWN’s THREE SYNONYMS. Loc. cit. 
BaKEVELLIA ANTIQUA, Minster. King, Catalogue, p. 10, 1848. 
AVICULA — 3 Howse, Trans., T. N. F. C., vol. i, p. 249, 1848. 
GERVILLIA KERATOPHAGA, Schlotheim. Geinitz, Versteinerungen, p. 10 (? partim), 1848. 
! T collected specimens of Bakevellia ceratophaga at Schlossberg von Kénitz. 
2 «A species of Avicula not very remote from the 4. soczalis of Schl. occurs in the Magnesian Marls at 
Collyhurst, near Manchester.’ (Op. cit.) 
