13G GUIDE TO THE FOSSIL INVERTEBEATE ANIMALS. 
Gallery their ormxment. Adjoining these are .shells from the Kella- 
ways Eock, a brownish sandstone at the base of the Oxford 
Clay, giving a name to the Callovian Age. Among these 
are Gnjphaea hilohata with a curious fold on its side, Isocardia 
minima, and Goniomya Y-scri 2 )ta. 
The shells of Bathonian age are arranged under the 
formations from which they come. First are those from the 
Table-ease widely distributed rubbly limestone called Cornbrash, which 
has yielded the scaphopod Dcntalucm annulaium, the 
gastropods Bulla undulata, Pseudomdania vittata, and the 
lamellibranchs Ghlamys \Pectcn\ vagans, Lima dxtplicata, 
• Pscudomonolis \_Avicnht\ ediinata, and several Trigonias. 
IVIany of the specimens are figured in Blake’s “ Monograph 
of Cornbrash Fossils.” There are very few shells from 
the Forest Marble, but among them is a fine examjile of 
Trigonia detrita figured by Lycett. In the equally small 
series from the Bradford Clay, one may notice a set of 
Table-cases Oxytoma \Amcula\ costata. The Great Oolite shells are 
^ mostly from the Oolitic freestone. Here is the type-specimen 
of Fteroccra Wrighti, a fine winged shell ; then several 
species of Purpuroidca, among which P. morrisea with its 
heavy spines is conspicuous ; several limpets, Patella, testify 
to the rocky nature of the sea-floor ; Ncrita rugosa seems 
to show bands of colour, and such are still more evident in a 
large form of Natica. Among lamellibranchs one may note 
TAma cardiiformis, Ptcroperna costatula. Pinna amjda, 
Paralldodon [Macrodon'] hirsonensis, and the massive Padiy- 
risma (“thick support”) grande. The Stonesfield Slate 
yields Trigonia impressa and Pinna cxineata. The small 
series from the Fuller’s Earth includes Volsella [Jilodiola'] 
imhricata and Ceromya plicata. 
Table-cases Next come shells from the variable series of marine 
12 & 13. limestones known as the Inferior Oolite, deposited mainly 
in Bajocian time. The chief localities in the south-west 
of England here represented are Dundry near Bristol, Half- 
way House near Yeovil, Bradford Abbas, and Leckhampton 
Hill near Cheltenham. These have yielded a fine series of 
Pleurotomaria, many species of Amberleya, Pseudomdania, 
Ptirpurina, Ddp>liinula, Ccriihium, Ciri'us, Nerinaea, Alaria, 
and otlier gastropods. Certain species of Amberleya, Ceri- 
tliium, Onustus, and Neridonms acquired an interest a few 
years ago from their resemblance to some shells now living 
in Lake Tanganyika; but it is not now imagined that 
the animals themselves had the same structure. Similar 
