INFEKIOK OOLITE. 
49 
shire the characteristic Ammonite is fairly abundant and well- 
marked, but in several places in that county we find only very 
small specimens of a form that has been termed A. humphriesianus, 
and this is the case further on in Gloucestershire. The zone has 
nowhere been recognized in the midland counties, perhaps on 
account of the absence of the Ammonite. Where the species does 
occur in the Inferior Oolite, the fossils associated with it connect 
the so-called zone intimately with the beds above and below. 
It forms in fact a sort of passage-bed between the zones of 
A. Murchisonce and A. Parkinsoni', but for convenience-sake we 
may put it, as Mr. Hudleston does, in the Upper Division of the 
Inferior Oolite. 
Oppel records, from the A. Sauzei-bed, A. Brocchii, A. Brongniarti, and 
A. Sowerbyi, and in one part of his work he included this bed at the 
base of the A. Humphries ianus-bed.* This is the position assigned to it 
by Mr. Hudlesbon. who regards it as an appendage to the Humpliriesianus- 
zone. He says the most mixed fauna occurs in the " Sauz&i-\>ed " of 
Oborne, and some might class it with the Lower division of the Inferior 
Oolite.f 
Mr. S. S. Buckman remarks, " Where the Sowerbyi and Sauzei-zonea 
are well developed, as would appear to be the case in certain localities on 
the Continent, it may be possible to separate them distinctly; but at 
Dundry we find peculiar conditions, because it would appear that 
Am. Sowerbyi, Am. Sauzei, and Am. humphriesianus occupy the same 
horizon."| 
Locally in Dorsetshire he recognizes another zone above that of 
A. humphriesianus, the zone of A. cadomensis. 
List of Fossils from the Zone of Ammonites humphriesianus. 
Ammonites Blagdeni. 
Braikenridgei. 
Brocchii. 
Brongniarti. 
cadomensis. 
edouardianus. 
garantianus. 
Gervillei. 
humphriesianus (Fig. 17). 
Sauzei. 
subfurcatus. 
Wrighti. 
Belemnites gingensis. 
Nautilus polygoualis. 
truncatus. 
Bourguetia striata (Phasianella 
Saemanni). 
Pleurotomaria granulata. 
punctata. 
Pseudomelania coarctata, 
(Chemnitzia) lineata. 
( ) procera. 
Purpurina bellona. 
inflata. 
Spinigera longispina. 
Astarte planata. 
Cypricardia cordiformis (Fig. 
19). 
Grypbasa sublobata. 
Hinnites abjectus. 
Myacites jurassi. 
Rhynchonella spinosa (Fig. 29). 
Terebrattila sphseroidalis. 
Waldheimia carinata. 
* Juraformation, p. 305. 
f Inf. Ool. Gasteropoda, p. 28. 
Inf. Ool. Ammonites, p. 63. 
Rep. Brit. Assoc. for 1891 (1892), p. 655. 
E 75928. 
D 
