﻿JURASSIC AND TRIASSIC BRACHIOPODA. 



123 



1819 Lamarck describes two distinct species under the name of Kleinii, one of which is 

 evidently a much biplicated variety of the shell under description. 



T. perovalis is very variable in shape, and especially in the degree of biplioation of 

 its valves. Specimens, however, from the Inferior Oolite of Dundry, Yeovil, and some 

 other places are perfectly identical in shape with others that occur in the same for- 

 mation at Les Moutiers, in Normandy, where the shell acquires very large proportions. 



In full-grown individuals the biplication, so often observable in smaller examples, is 

 quite obliterated, the valves being almost uniformly convex. 



In specimens from other localities the biplication of the valves is so strongly defined, 

 as in the variety Kleinii, that palaeontologists have often applied to them the unfortunate 

 name of biplicata, which belongs exclusively to a species from the Gault and Upper Green- 

 sand. 



The name perovalis has also been given by different authors to shells to which it really 

 does not belong. 



The variety T. Kleinii, of Lamarck, has also been found by Mr. Walker in a sandy bed 

 under the Trigonia-grit, at Leckhampton Hill, Cheltenham (Sup., PI. XVII, fig. 9). 



82. Terebratula Philippsii, Morris. Dav., Ool. Mon., p. 53, PI. XI, figs. 6 — 8, 



and Appendix A, fig. 14 ; Sup., 

 PI. XVII, fig. 10. 



Terebratula Philippsii, Desl. Brach. Jurassiques, Pal. FraiK^., p. 252, pis. 



lxvi — Ixxiii, 1862. 



Almost every variation of this species has been admirably illustrated by Mr. Deslong- 

 champs in the work above alluded to. He states that it is very abundant in the 

 Inferior Oolite in the horizon of Am. Humphresianus, and in the beds characterised by 

 Am. Parkinsoni, and that it occurs, though much less numerously, in the Puller's Earth 

 and Great Oolite of Prance. 



83. Terebratula intermedia, Sow. Dav., Ool. Mon., p. 52, PI. XI, figs. 1 — 5 ; 



Sup., PI. XVII, fig. 12. 



T. intermedia is usually found in the Cornbrash ; but, according to the Rev. A. W. 

 Griesbach, it occurs also in the Great Oolite of Wollaston. In one specimen traces of the 

 original colour are preserved in the shape of radiating stripes. 



