﻿SUPPLEMENT TO THE BIVALVIA. 



15 



Length, fths of an inch ; height, -f^ths of an inch. 



Localities. Britain : Hordle (S. Wood). 



Prance : Grignon, Perme de l'Orme. 



This species is not very rare in the purely freshwater deposit of Hordle. It is very 

 transverse in form, with a narrow hinge and elongated lateral teeth, in which characters 

 only does it appear to differ from deperdita. It is also slightly inequilateral and some- 

 what tumid, with a smooth exterior and a rather depressed umbo. 



20. Cyrena obliqua ? Deshages. Tab. B, fig. 14. 



Cyrena obliqua, Desk. Coq. Foss. des Env. de Par., t. i, p. 122, pi. 19, figs. 5, 6, 

 1824. 



— obliquata, S. Wood. Lond. Geol. Journ., p. 118, 1847. 



Spec. Char. 11 C. Testa ovato-transversd, obliqua, substriatd, sub-aquilaterali ; wnbo- 

 nibus obliquis, productiusculis, dentibus cardinalibus tribus, valvd dextrd, duobus, sinistra, 

 lateralibus minimis ; latere antico lavigato, postico tenuissime striato." (Desh.) 



Length, y%ths of an inch ; height, fths of an inch. 



Localities. Britain : Hordle (S. Wood). 



Prance : Soissons (Deshages). 



A few specimens are in my cabinet, which appear to correspond with the Prench 

 fossil which M. Deshayes originally constituted a distinct species in his first work on 

 the fossils of the Paris Basin, and has preserved in his more copious and recent work, 

 ' An. Poss. du Bas. de Par.,' p. 50G. This is the shell spoken of by me in the 'London 

 Geol. Journal' as obliquata, and there regarded by me as a variety of deperdita and 

 cgcladiformis. Probably M. Deshayes' suite of specimens of the three forms show 

 greater differences than mine, and justify the separation. 



21. Cyrena pulchra, Sowerbg. Tab. B, fig. 7 a, b. 



Cyclas fulcher, J. Soio. Min. Conch., t. 527, fig. 1, 1826. 



— pulchra, Morris. Catal. Brit. Foss., 2nd edit., p. 200, 1854. 



— Forbes. Mem. Geol. Surv. (Isle of Wight), p. 148, pi. iii, fig. 1, 1856. 

 Cyrena — J. Lowry. Chart Brit. Tert. Foss., pi. ii, 1866. 



— — ? Sandberger. Land-Conch., p. 308, t. xx, figs. 1, 1 a, 1872. 



Spec. Char. C. Testa crassd, suborbiculari, subaqnilalerali, antice paulo minore, 

 postice clilatatd, obtuse angulatd, laevigata vel irregulariter striata, umbonibus prominulis, 

 cardine crassiusculo ; dentibus inaqualibus, in valvd sinistra duobus primis majoribus, in 



