In 1833, T. N. Wetherell, Esq., of Highgate, discovered several Foraminifera in some London Clay taken from a well at the Lower Heath, on the south side of Hampstead; see Proceed. Geol. Soc. vol. ii. 1834, p. 93, and Transact. Geol. Soc. 2 ser. vol. v. p. 131. In plate ix., one of the two plates accompanying Mr. Wetherell's paper in the Geol. Transactions, these Foraminifera, with other small fossils from the clay, were figured by Mr. J. De C. Sowerby, by whose help also the determination of the fossils was made.

At page 135 of Mr. Wetherell's paper, the figured Foraminifera are referred to as “Nodosaria, pl. ix. figs. 3–7; Articulina, figs. 8–10; Marginulina, fig. 12; Kotalin, figs. 13–18; Cristellaria, fig. 19; Miliola, fig. 20.” Fig. 11, doubtfully referred to “Frondiculina,” is not a Foraminifer, but probably the cast of the palettes of a Teredo; a similar fossil is figured and thus designated by D'Archiac in the Mém. Soc. Géol. Franc. We have seen, in Mr. Wetherell's collection, the Foraminifera from the well above-mentioned, as well as others from the London Clay of Hampstead, Highgate, and Finchley. We possess a large series of picked specimens collected by Mr. John Purdue from the London Clay of the Copenhagen Fields, Islington, when the cuttings for the Great Northern Railway were being made; also some from the London Clay of Finchley, Chelsea (bed of the Thames), and Clapham; and a very fine suite of specimens from Wimbledon Common (out of the clay at about 100 feet in depth).