﻿SUPPLEMENT TO THE BIVALVIA. 



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1. Scrobiculabra Condamini, Morris. Tab. A, fig. 1. 



Psammobia? Condamini, Morris. Geol. Journ., vol. x, p. 138, pi. ii, fig. 15, 1854. 



— — Watelet. Cat. Moll, des Sables inferieurs, p. 16, 18/0. 



Thracia Bazini? Desk. An. sans Vert, du Bas. de Par., p. 267, pi. xv, fig. 3, 1860. 

 Psammobia Condamini, Whitaker. Mem. Geol. Surv., vol. iv, p. 577, 1872. 



Spec. Char. " Testa ovato -transversa, incecpdlaterali, depressd, subinaquivalvi, 

 concentrice et irregulariter striata, margine antico rotundato, postico rostrato, attenuato, 

 sinuato, margine postico sub -incur vato, declivi." — Morris. 



Length. Ifths of an inch. 



Localities. Counter Hill, Upnor {Be la Condamine). 



Charlton, Deptford (A. Bott), Dulwich ( Meyer) . 



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 

 a right 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 

 Scrobiculabra. 



2. Scrobiculabra Dulwichiensis, S. Wood. Tab. A, fig. 16 a — c. 



Spec. Char. S. Testa tenui, elongato-ovald, subincequilaterali ; concentrice et obsolete 

 striata; umbonibus depressis ; latere antico rotundato, latere postico obtuse angulato. 

 Margine dorsali subangulata, margine ventrali late arcuato. 



Length, 1 inch ; height, ^ inch. 



Locality. Dulwich {A. 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 Buhoichiensis from the place of its occurrence. 



