SUPPLEMENT TO THE BIVALVIA. 21 
1. ScropicuLaBra Conpamini, Morris. Tab. A, fig. 1. 
Psammopia? Conpamint, Morris. Geol. Journ., vol. x, p. 138, pl. ii, fig. 15, 1854. 
— — Watelet. Cat. Moll. des Sables inférieurs, p. 16, 1870. 
Turacta Bazrn1? Desh. An. sans Vert. du Bas. de Par., p. 267, pl. xv, fig. 3, 1860. 
PsamMMoBIA Conpamint, Whitaker. Mem. Geol. Surv., vol. iv, p. 577, 1872. 
Spec. Char. “ Testé ovato-transversd, inequilaterali, depressd, subinequivalvi, 
concentrice et irregulariter striata, margine antico rotundato, postico rostrato, attenuato, 
sinuato, margine postico sub-incurvato, declivi.’—Morris. 
Length. 13ths of an inch. 
Localities. Counter Hill, Upnor (De la Condamine). 
Charlton, Deptford (4. Bott), Dulwich (Jeyer). 
Mr. Meyer has sent me several specimens of this shell, all of which seem to cor- 
respond sufficiently with the figure given by Morris as to show that they are the same 
shell. The specimen figured by me is a left valve, while that figured by Mr. Morris is 
aright one; and, as before observed, none of Mr. Meyer’s specimens allow of the interior 
being seen. Mr. Whitaker speaks in his memoir of a second species of Psam- 
mobia from the Woolwich and Reading beds of Theale, and of Castle Kiln, Reading; but 
as the specimens were, he informs me, only casts, it is of course impossible to specifically 
identify them, or to say whether they belong to the genus which I have called 
Serobiculabra. 
2. ScroprcuLaBra Dunwicuiensis, S. Wood. Tab. A, fig. 16 a—e. 
Spec. Char. 8. Testa tenui, elongato-ovatd, subinequilaterali ; concentricé et obsolete 
striata ; umbonibus depressis ; latere antico rotundato, latere postico obtuse angulato. 
Margine dorsali subangulata, margine ventrali late arcuato. 
Length, | inch; height, } inch. 
Locality. Dulwich (4. Bott). 
The specimen figured as above, and referred to in the remarks introducing the genus 
Scrobiculabra is unique, but the characters presented by its exterior appear to me to 
differ from those of Condamini so as to justify its specific separation, and I have accordingly 
assigned it the name of Dulwichiensis from the place of its occurrence. 
