230 
LOWER OOLITIC EOCKS OF ENGLAND : 
snlcontractus. This appears to be the form figured as " A. 
modiolaris " by William Smith, but it is not the same as the 
original A. modiolaris of Lhwyd. It should be mentioned that 
A. subcontracts has been recorded by E. Witchell* from the 
Clypeus Grit of Rodborough Hill, a fact of considerable interest 
as snowing the incoming in the upper part of the Inferior Oolite 
of this Bathonian type of Ammonite ; for the same species occurs 
in the Great Oolite. Ammonites viator (A. Morrisi of Oppel) 
and A. arbustigerus also occur in the Fullonian formation. 
The following are the more abundant and characteristic fossils 
of the Fullonian or Fuller's Earth formation : 
Lower 
Clay. 
Rock. 
Uppei 
Clay. 
Ammonites arbustigerus. (Fig. 63) 
bullatus 
subcontracts. (Fig. 64) 
viator - 
Belemnites parallel us 
Anatina plicatella 
Avicula costata 
echinata. (Fig. 124) - 
Ceromya plicata 
Cypricardia bathonica 
Goniomya angulifera 
literata 
Gresslya peregrina. (Fig. 121) 
Homomya gibbosa - 
Isocardia minima 
nitida - 
Modiola gibbosa - 
Lonsdalei - 
Myacites calceiformis 
tenuistriatus 
Nucula variabilis - 
Ostrea acuminata. (Fig. 65) 
Sowerbyi. (Fig. 95) - 
subrugulosa. (Fig. 110) 
Pecten vagans. (Fig. 122) - 
Pholadomya deltoidea 
Placunopsis socialis 
Rhynchonella varians. (Fig. 67) - 
Terebratula globata. (Fig. 28) 
Waldheimia ornithocephala. (Fig. 66) 
Prof. Tate in 1870 argued that the " Fuller's Earth " formation 
should on palaeontological grounds be considered as the upper- 
most zone of the Inferior Oolite, because, of the species he had 
been able to catalogue, 69 in number or 83 per cent, occurred in 
the Inferior Oolite, and 49 only or 60 per cent, in the Great 
Oolite.t The results obtained from specimens collected during 
recent work on the Geological Survey, are at variance with those of 
Prof. Tate. Of 72 species collected by Mr. Rhodes and myself, 
58 are known also in the Great Oolite, and 42 in the Inferior 
Oolite, a number being common to the two formations. 
* Proc. Cotteswold Club, vol. vii. p. 125. 
f Quart. Journ. Science, vol. vii., 1870, p. 68. 
