FOSSILS OF THE INFERIOR OOLITE SEUIES. 35 
Organic Remains. 
The Inferior Oolite Series has yielded a, rich and varied 
Invertebrate fauna, but the remains of Saurians and Fishes are 
very rare. 
The Reptilia that have been found, include Megalosaurus and 
SteneosauruS) and the Fishes are represented by Hybodus, 
Strop Jiodus, &c. 
Of Mollusca, Ammonites are exceedingly abundant in Dorset- 
shire and, at a more restricted horizon, in Gloucestershire. The 
larger cut and polished Ammonites and Nautili of dealers, are 
mostly obtained from the Inferior Oolite of Dorsetshire. One of 
the largest examples of Nautilus known, a gigantic specimen 
2 feet in diameter, obtained from Sherborne in Dorsetshire, 
has been described under the name of Nautilus ornatus* 
Belemnites are common in certain beds ; Ancyloceras and 
Toxoceras are also recorded. 
Gasteropods are plentiful in the limestones in Dorsetshire, 
south Somerset, and the midland counties ; they include 
Actceonina, Alaria, Amberleya, Bourguctia, Cerithium, Cylindrites, 
Malaptera (Pterocera), Monodonta, Natica, Nerincea, Ncrita, 
Pleurotomaria, Pseudomelania, Purpurina, Trochus, Turbo, &c. 
Nerincea first appears near the base of the formation ; the species 
recorded from the Lias in this country, according to Mr. Hudleston, 
do not belong to this genus. Ataphrus {Monodonta) Icevigatus 
and Natica adducta occur at various horizons. 
The Lamellibranchs also are abundant, including Area, 
Astarte, Cardium, Ceromya, Cucullcea, Cypricardia, Gervillia, 
Grcsslya, Grypkcea, Hinnitcs, Homomya, Isocardia, Lima, Lucina, 
Modiola, Myacites, Nucula, Opis, Ostrea, Pecten, Perna, Phola- 
domya, Pinna, Tancredia, Trichitcs, Trigonia, &c. Of these 
genera, Trigonia is especially abundant and characteristic. Some 
of the species, such aw Astarte elegant, A. cxcavata, Avicula 
incequivalvis, Ceromya bajociana, Gresslya abducta, Hinnitcs 
abjectus,!!. vclatus, Lima strigillata,L,. duplicata, L.pectiniformis, 
Lucina despecta, L. Wrighti, Modiola soioerbyana (plicata), 
Pcctcn demissus, Pholudomya fidicula, P. Heraulti, P. media, 
Tancredia axiniformis, Trigonia costata, and T. signata are 
abundant at various horizons. 
Most numerous nre the Brachiopods, including Rkynchonella, 
Terebratula, and Waldhcirnia. Some of the species are locally 
taken to mark horizons, as the /?moa-8tage characterized by 
Rltynchonella spinosa, the Globata-bed by Terebratula globata, 
the -FzV?zZ>?*m-stage by Terebratula jimbria, and the Cynoccpha.la- 
stage by Rhynchonella cynocepliala. The species in fact occur 
profusely in certain la}-ers, forming fossil-beds, but they are not 
as a rule confined to such beds. In Gloucestershire the specimens 
of T. globata early attracted the attention of the country people, 
* A. H. Foord and G. C. Crick, Aun. Nat. Hist., ser. vi , vol. v. p. 273. 
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