466 EH. Neaverson—Foraminifera of the Hartwell Clay. 
Localities : Hartwell (a.) ; Aylesbury (r.) ; Bierton (r.) ; Wheatley, 
bed 2 (a.). 
Cristellaria gibba d’Orb. 
C. gibba @’ Orbigny, 1839 ; Foram. Cuba, p. 63, pl. vii, fig. 20. 
C. gibba Brady, 1884; Chall. Rep., vol. ix, p. 548, pl. lxix, figs. 8, 9. 
C. gibba Chapman, 1896 ; Journ. Roy. Micr. Soc., p. 4, pl. i, fig. 7. 
C. gibba Sherleck, 1914 ; Guou. Mac., p. 261, pl. xix, fig. 9. 
This species ranges from the Lias to the present day, and is 
recorded from many of the Lower Cretaceous deposits as well as from 
the Hartwell Clay (Chapman). It is recorded living from the North 
Atlantic and South Pacific at depths of less than 500 fathoms, “ but 
this is probably only a small portion of the area it inhabits” — 
(Brady). 
Localities: Hartwell (c.); Long Crendon (f.). 
Cristellaria crepidula (F. & M.). 
Nautilus crepidula Fichtel & Moll, 1798; Test Micr., p. 107, pl. xix, figs. g-t. 
Cristellaria crepidula d’Orbigny, 1889 ; foram. Cuba, p. 64, pl. viii, figs. 17-18. 
C. crepidula Brady, 1884 ; Chall. Rep., vol. ix, p. 542, pl. Ixvii, figs. 17, 19, 20 ; 
pl. Ixviii, figs. 1, 2. 
C. crepidula Chapman, 1894 ; Journ. Roy. Micr. Soc., p. 648, pl. ix, fig. 8. 
Under this name are included the strongly compressed, non- 
carinate, elongate Cristellarians, with depressed septal lines and 
narrow, almost vertical septal face. The form shows considerable 
variation of outline, and this variation is so gradual that no strict 
identification of the numerous “ species”’ can be made. Ranging 
from the Lias, C. crepidula is now found in all existing seas and at 
all depths, but is nowhere very abundant (Brady). 
Localities: Hartwell (c.); Bierton (r.); Wheatley and Shotover 
Hall bed 2:(c:); bed 1\(x:). : 
Subfamily POLYMORPHIN Ai, 
PotymMorPHINA d’Orbigny, 1826. 
Polymorphina fusiformis Roemer. 
Roepe (Globulina) fusiformis Roemer, 1838; Neues Jahrb., p. 386, 
P. Le oes 1896; Journ. Roy. Micr. Soc., p. 11, pl. ii, fig. 9. 
P. fusiformis Sherlock, 1914; Gon. Mac., p. 263, pl. xix, fig. 12. 
The question of nomenclature of this variable form has been 
discussed by Chapman (1896, p. 11) and Sherlock (1914, p. 264). 
The species is recorded from the Upper Hils and Minimus-clay of 
Germany (Reuss), Gault of France (Berthelin), and the Gault of 
Folkestone (Chapman). It still lives at depths down to 
2,400 fathoms (Brady). 
Localities: Hartwell (v.r.); Wheatley, bed 2 (v.r.); Shotover 
Hill, bed 1 (v.r.). 
