170 PERMIAN FOSSILS. 
Collywesten, and between Mar and Hickleton. Mr. Binney has collected specimens 
at Hampole, in Yorkshire, and at Kirkby Woodhouse, Notts. Count Miinster records 
its occurrence at Gliicksbrunn ; and it is probably found at most of the other German 
localities noticed under the last species. M. de Verneuil has procured it in the 
Permian rocks of Tioplova, Kliutziski, Pinega, Itschalki, and Barnoukova, in Russia ; 
and in the Carboniferous deposits at Mala, Jaroslayetz, and near Vitegra. Count 
Keyserling found specimens in the Permian Limestone on the Wytschegda, near Ust- 
Nem, and on the Wymm, in Petschora-land. Count Minster records its occurrence 
in the Trias (?) Marls of St. Kassian. 
BAKEVELLIA TUMIDA, King. Plate XIV, figs. 35, 36, 37. 
(?) SMALL species oF Moprota, J. de C, Sow. Trans. Geol. Soc. Lond., 2d series, vol. iii, 
p. 119, 1829. 
GERVILLIA (?) TUMIDA, King. De Verneuil, Bull. Soc. Géol. de France, 2™° série, t. i, 
p. 33, 1844. 
— = » Geol. Russ., vol. i, p. 225, 1845. 
= == » Tennant, Strat. List, p. 88, 1847. 
BakEVELLIA — » Catalogue, p. 10, 1848. 
AVICULA INFLATA, Brown. Howse, Trans. T. N. F. C., vol. i, p. 250, 1848. 
Diagnosis —Modioliform: longer than wide, the length being half an inch, and the 
width a quarter. Valves convex; (?) smooth. Umbones divaricated ; slightly incurved. 
Anterior lobes distinct. Posterior wings very slightly produced. Hinge-areas large ; 
with four or five cartilage-pits. Byssal or pedal sinus rather large in the under valve. 
This is a well-marked shell, easily distinguished from the former two species, even 
the most tumid variety (= Avicula inflata, Brown) of Bakevellia antiqua, in being longer 
than wide, and in the greater divarication of the umbones. It also appears to be a 
smaller species. 
Bakevelliu tumida occurs rarely at Tunstall Hill and Dalton-le-Dale, and rather 
commonly at Humbleton Quarry and Ryhope Field-House Farm, in Shell-limestone. 
BAKEVELLIA BICARINATA, King. Plate XIV, figs. 41, 42. 
BAKEVELLIA BICARINATA, King. Catalogue, p. 10, 1848. 
Diagnosis.—“ Nearly smooth, winged, and furnished with two faint ridges on its 
anterior lobes.” (King.) 
This species, which I have elsewhere supposed to be a variety of one of the 
former species, is somewhat intermediate in form to Lakevelha ceratophaga and Bake- 
vellia antiqua; though evidently more related to the former.’ Its ridges diverge (vide 
1 Catalogue, p. 10. A mistake was made in stating that Bakevellia bicarinata “may be a variety of 
B. antiqua: B. ceratophaga was intended for the last species. 
