22 LOWER OOLITIC ROCKS OF ENGLAND! 
Inferior Oolite with that of the very similar sediments of the 
Cornbrash : in both are some identical or closely allied species of 
Echinobrissus and Clypeus, of Area, Astartc, Cardium, Ccromya, 
Cypricardia, Gervillia, Goniomya, Gresslya, Hinnites, Lima., 
Modiola, Myacites, Plwladomya, &c. In comparing the successive 
formations of clay, like the Oxford and Kimeridge Clay, we do not 
find any marked repetition of specific forms. Some species of 
Astarte, Goniomya, Modiola, Pecten and Thracia are however 
common to the two formations. Cephalopoda are abundant in 
both, but the species are with few exceptions distinct. 
General remarks on the fauna and flora of the Jurassic rocks 
have been given in the introductory portion of the Memoir on the 
Lias of England and Wales (Yorkshire excepted). 
In the Oolitic rocks one of the most noteworthy facts is the 
preservation of Mammalian remains in the Stonesfield Slate and 
Purbeck Beds. 
Among the Reptiles some winged forms occur, but the 
Dinosaurians are more prominent. Some of the bones of the 
Cetiosaurus are of gigantic size, one femur measuring upwards of 
5 feet in length. Remains of Megalosaurus and Omosaurus are 
likewise characteristic ; while of the Crocodilians, .Teleosaurus and 
Steneosaurus are the more abundant forms. Turtles are preserved 
in the Stone-afield Slate, Portland and Purbeck Beds, and 
occasionally remains of them are found in other formations. 
Fishes are abundant, more particularly species of Lepidotus, 
Mesodon (" Pycnodus "), Strophodus, and Aster acanthus* 
Ammonites and Belemnites are most abundant in the clays, and 
in some of the earthy limestones. They are rare in the false- 
bedded oolites. In these oolites we find occasional bands of 
Corals; and, as remarked by Prof. Duncan, Cephalopods and 
Saurians are rarely found in relation with them. 
Among the Gasteropods, Nerincea and Purpuroidea make their 
appearance, and other forms such as Amberleya, Alaria, Cerithium, 
Plcurotomaria, and Pseudomelania are fairly abundant. Of La- 
mellibranchs Astarte, Avicula, Lima, Pecten, Cardium, Ceromya, 
Isocardia, Trigonia, Pholadomya, Myacites, and Ostrca are the 
more conspicuous forms. 
Brachiopods occur in the oolitic limestones, in rich fossil-beds. 
Polyzoa have been found in abundance in the Inferior Oolite and 
Great Oolite Series ; but few traces have at present been recorded 
from the Corallian rocks where they might have been expected. 
Echinodermata are plentiful in the limestones ; and some being of 
a gregarious nature, large numbers of one species of Echinoid such 
as Acrosalenia and Hemicidaris are occasionally met with at a 
particular locality. Among the Crinoids, such forms as Apiocrinus 
and Millcricrinus furnish characteristic species ; and there are 
also Comatulce or Feather Stars of the genus An tedon. t 
* See A. S. Woodward, Proc. Geol. Assoc., vol. xi. p. 285 ; vol. xii. p. 238. 
f Portions of Antedon have been described under the name Solanocrmiift. See 
Moore, Geol. Mag. 1875, p. 627. 
