SUPPLEMENT TO THE BIVALVIA. gi 
Length, 2 inches ; height, 14 inches. 
Locality. Dulwich. 
Several specimens of this species have been put into my hands by Mr. Meyer and 
Mr. C. Evans, but they have all the valves united, or have the shell embedded in the 
matrix so as not to exhibit clearly the dental furniture, or impressions by the muscles. 
Mr. Meyer has, however, so far cleared the hinge of a left valve as to show that it has 
two unequally elongated, lateral teeth, with what seem to be two triangular, cardinal 
denticles, and a ledge for an external or ligamentous connector; so that we can con- 
fidently place it as a Cyrena. The large specimen which I have had figured, and which 
belongs to Mr. Meyer, is smooth; but there are two nearly obsolete rays. In other 
specimens, however, these rays are more numerous, and vary from 6 to 10. 
T have given representations of some different forms. One of these has the posterior 
or siphonal side somewhat pointed, and another has this side broader, and the shell is 
nearly cylindrical, the posterior side being as broad or high as the anterior. 
A full description of this species was given by Mr. Edwards, as above referred to. 
7. CyRENA INTERMEDIA? WMelleville. Tab. A, fig. 8 a, 0. 
CyrENA INTERMEDIA, Mellev. Sab. Tert. infér. Bas. de Par., p. 35, pl. ii, figs. 5, 6, 
1843. 
a _— Prestwich. Quart. Journ. Geol. Soc., vol. x, p. 155, pl. ii, 
figs. 10, 11, 1854. 
_— —_ ? Desh. An. sans Vert. du Bas. de Par., p. 514, pl. xxxviii, 
figs. 19, 20, 1860. 
— (LOXOPTYCHODON) INTERMEDIA, Sandberger. Land- und Siissw.-Conch., p. 163, 
t. x, fig. 3, 1872. 
Spec. Char. C. Testdé transversd, oblongo-subtrigond, inequilaterali, obsolete trans- 
versim striata ; umbonibus prominulis obliquis, cardine tridentato, dentibus lateralibus sub- 
aqualibus, striatis. 
Length, *ths of an inch. 
Localities. Britain: Charlton (8. Wood), Sundridge (Meyer). 
France: Lignites. 
This shell corresponds with the one given by Mr. Prestwich, as above referred to; 
but I agree with him that its identity with the shell figured and described by Melleville 
is doubtful, as Melleville’s figure represents a larger shell with a narrower hinge, and more 
rounded posterior side. I have therefore put a mark of doubt to the above name. M. 
Deshayes has figured and described another shell under the name of C. Deshayesié, 
Hébert, which rather more resembles our shell in having a more pointed posterior side, 
but the umbo is less prominent, and the shell more inequilateral as well as larger. 
