85 
ON THE FOEAMINIFERA OF THE LONDON CLAY. 
By PfiOFESsoE T. KtrpEET Jones, F.G.S., and W. K. Parker, Esq. 
In 1833, T. N. Wetlierell, Esq., of Highgate, discovered several 
Eoraminifera in some London Clay taken from a well at the Lower 
Heath, on the south side of Hampstead; see Proceed. G-eol. Soc. 
vol. ii. 183i, p. 93, and Transact. Geol. Soc. 2 ser. vol. v. p. 131. In 
plate ix., one of the two plates accompanying Mr. AVetherell's paper 
in the Geol. Transactions, these Foraminifera, with other small 
I fossils from the cla}^ 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, pi. ix. figs. 3-7; Articulina, figs. 8- 
I 10; Marginulina, fig. 12; Rotalia, figs. 13-18; Cristellaria, fig. 19; 
I 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 
Mem. Soc. Geol. Franc. We have seen, in Mr. Wetherell's collec- 
tion, 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, 
I when the cuttings for the Great Northern Kailway 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). 
1 The last-mentioned series is probably a nearly complete local Fora- 
miniferal fauna ; for very many pounds of the clay were minutely 
examined, and there are only one species, and three varieties of 
two other species, to be added from our other gatherings from the 
London Clay. 
With regard to the figured specimens from the well near Hamp- 
stead, the following is our determination of the species and varieties ; 
most of the latter, however, as well as the real species, have distinct 
names, as is common and convenient with Foraminifera : — 
Geol. Trans. 2 ser. vol. v. pi. ix fig. 3. Dentalina Buchi, Eeuss, 
d. g. Ges. Zeitsch. ii. pi. iii. fig. 6. The specimen, still preserved by Mr. 
Wetherell, shows the characteristic, minute, longitudinal riblets cross- 
ing the septal constrictions, but not seen in the figure. This is not 
an uncommon variety in some Tertiary deposits. 
Fig. 4. Dentalina eJegans, D'Orb. Foram. Foss. Bas. Vien. pi. i. 
fig. 52. This is a fragment of one of the manifold subvarieties or 
individual modifications of i>. commums, D'Orb., which has abundant 
representatives in the living and fossil states. 
Fig. 5. Dtntalina spinulosa, Montagu, Test. Brit. Suppl. pi. xix. 
fig. 5, p. 86. A fragment, figured upside down. A similar fragment, 
figured and described by Montagu, obtained by Mr. Boys from the 
