EL. Neawverson—Foraminifera of the Hartwell Clay. 467 
Family GLOBIGERINIDZ. 
GLOBIGERINA d’Orbigny, 1826. 
Globigerina marginata, Reuss. 
eee marginaia Reuss, 1845: Verstein. bdhm. Kreid., pt. i, p. 36, pl. xiii, 
g. 471, 
Globigerina marginata Reuss, 1874; In Geinitz, Palewontographica, xx (2), 
(Os. JES INOS 
G. marginata Brady, 1879; @.J.M.S., vol. xix, N.S., p. 74. 
G. marginata Brady, 1884; Chall. Rep., vol. ix, p. 597. 
This form, which closely resembles its isomorph Pulvinulina 
menardi dOrb., is recorded from Hartwell by Chapman. It was 
previously restricted to the Cretaceous as a fossil form, being found 
originally in the Chalk of Bohemia (Reuss). It1is very rare in Recent 
deposits (Brady). 
Localities : Hartwell (f.) ; Wheatley, bed 2 (a.). 
Globigerina cretacea d’Orb. 
Globigerina cretacea d’Orbigny, 1840 ; Mém. Soc. Géol. Fr., ser. 1, vol. iv, p. 34, 
pl. iii, fiys. 12-14. 
G. cretacea Chapman, 1896 ; Journ. Roy. Micr. Soc., p. 588, pl. xiii, figs. 5, 6. 
Several small specimens are placed in this species, which is a 
characteristic Cretaceous form. It is common in all zones of the 
Gault of Folkestone (Chapman), and ranges into modern times 
(Brady). This is the first record of the species below the Cretaceous. 
Locality : Hartwell (f.). 
Family ROTALIIDZ. 
Subfamily ROTALIIN A. 
PuLvinuuina Parker & Jones, 1862. 
One specimen from Long Crendon belongs to this genus, but it 
is so badly worn that specific determination is not possible. The 
rarity of Pulvinuline in the Hartwell Clay is in sharp contrast with 
the abundance of the genus in the Speeton Clay of Yorkshire. 
COMPARISON WITH OTHER DEPOSITS OF THE DISTRICT. 
For purposes of comparison various deposits near Aylesbury were 
examined for Foraminifera, and the results are given below :— 
Lower Gault—Ford, 4 miles S.W. of Aylesbury. Dark-blue clay 
with abundant grains of quartz, glauconite, and phosphatic material, 
formerly worked for “ coprolites”. Over 130 species of Foraminifera 
were found by the writer and Mr. Hollis, of Aylesbury.!. There are 
minor differences in distribution as compared with the Gault - 
Foraminifera from Folkestone. The following fourteen species occur 
in the Gault at Ford and also in the Hartwell Clay. Reophax 
scorprurus Montf.(v.r.); Haplophragmium acutidorsatum Hantken (£.); 
Thurammina albicans Brady (r.) ; Nodosaria (Gl.) humilis Roem. (r.) ; 
N. (D.) fontannesi Berth. (v.r.); Marginulina linearis Reuss (r.) ; 
M. Jonesi Reuss (r.) ; Cristellaria humilis Reuss (v.r.) ; C. navicula 
1 The Naturalist, July, 1921, pp. 235-240. 
