H. Neaverson—Foraminifera of the Hartwell Clay. 465 
species has been recorded from the Gault of Folkestone (Reuss, 
Chapman), and the Aptian beds of Surrey (Chapman). 
Localities : Hartwell (v.r.); Whitchurch (v.r.); Long Crendon 
(v.r.). 
Cristellaria fragraria (Giimbel). (Pl. IX, Figs. 9, 10.) 
Marginulina fragraria Gimbel, 1868; Abh. m.-ph. Cl. k.-bayer Ak. Wiss., 
vol. x, p. 635, pl. i, figs. 58a-c. 
Cristellaria fragraria Burrows & Holland, 1897; Proc. Geol. Assoc., vol. xv, 
p. 38,. pl. iii. 
Numerous specimens from Long Crendon agree with Giimbel’s 
figure 58a, and with the series of figures given by Burrows & Holland. 
Specimens from Hartwell have a different development in the 
younger portions of the test which is more elongated and more con- 
stricted at the septa, the chambers being more elobular ( (cf. Giimbel’s 
figure 58c). The tubercles which ornamented the earlier septa are 
not seen in the later part of the test, whereas longitudinal strie are 
here developed. Both forms, therefore, agree in showing catagenesis 
of ornament, from tuberculate to striate, but the later (Hartwell) 
form exhibits a more advanced degree of uncoiling. C. fragraria, 
which is abundant in the London Clay, has already been noted from 
the Hartwell Clay (Chapman). It also occurs in the Nummulitic 
Marl of the Bavarian Alps (Giimbel), and in the Clavulina Szabéi 
beds of Hungary (Hantken). Recent specimens were obtained from 
Torres Str. (155 fath.) and off the coast of 8. America (350 fath.) 
only (Brady). 
Localities: Hartwell (a.); Bierton (v.r.); Long Crendon (a.) ; 
Wheatley, bed 2 (v.r.). 
Cristellaria cultrata (Montfort). 
Robulus cultrata Montfort, 1808 ; Conchyl. Syst., vol. i, p. 214. 
Cristellaria cultrata Brady, 1884 ; Chall. Rep., vol. ix, p. 550, pl. Ixx, figs. 4-6. 
C. cultrata Sherlock, 1914 ; Gror. MaG., p. 262, pl. xix, fig. 4 
This species, which ranges from the Lias to the present day, was 
noted from Hartwell by Chapman. It is a common form and has 
been recorded from most of the Jurassic and Cretaceous deposits. 
At the present day it has a world-wide distribution and is found at 
all depths (Brady). 
Localities : Hartwell (a.); Aylesbury (a.); Bierton (a.) ; Whit- 
church (c.) ; Long Crendon (v.r.) ; Wheatley (a.) ; Shotover Hill (r.). 
Cristellaria Roemert Reuss. (Pl. IX, Fig. 8.) 
C. Roemeri Reuss, 1862 ; Sitz. k. Akad. Wiss. Wien., vol. xlvi, p. 75, pl. viii, 
fiz. 9 
Numerous rotulate Cristellarians with limbate sutures are referred 
to this species which was found by Reuss in the Middle Hils, Speeton 
Clay, and Minimus-clay of Germany. It does not appear to have 
been recorded since. 
Two specimens from Wheatley show a decided tendency towards 
uncoiling ; these are referred to C. Roemeri for the present, until 
more material is available for study. 
VOL. LVIII.—NO. X. 30 
