By G. Poulett Scrope, Esq., UP. 99 
shells which are abundantly found through these strata. An oppor- 
tunity may, perhaps, be taken for this in subsequent numbers. It 
is sufficient here to say, that in the lias marls and sands many 
species of Ammonites and Nautili are found, as well as of Belemnites, 
Gryphea, Modiola, Arca, Cypricardia, Trigonia, Terebratula, §c. The 
Fig... (401 Lyell) most frequent, perhaps, is a species of oyster, 
or Gryphea, from the abundance of which 
the lias has sometimes been called Gryphite 
limestone. The shells of the inferior oolite 
chiefly belong to the species of Lima, Pec- 
ae tae} ae ten, Avicula, Hinnites, Ostrea, Arca, Trigonia, 
Terebratula, Thecidium, Nerinea, Cerithium, Natica, Trochus, &e. 
Among the most characteristic shells of the inferior oolite may 
be instanced Terebratula fimbria (fig. 2). Rhynchonella spinosa, 
Fig. 2 (387). 
Fig. 3 (388). Bie (ol 
a. Pholadomya fidicula. 4 nat.size.Inf.Ool. 
Terebratula fimbria. Rhynchonella spinosa. b. Heart-shaped anterior termination of 
Inferior Oolite. Inferior Oolite. the same. 
(fig. 3).  Pholadomya fidicula, (fig. 4.) and Ostrea Marshii, 
(fig. 5). Some beds contain beautifully preserved specimens 
of Sea-urchins or Echinodermata, with their spines. The Fuller’s 
earth abounds in the small oyster, represented in fig. 6. The 
great oolite in Terebratula digona (fig. 7). Patella rugosa, (fig. 8.) 
7). 
Fig. 5 (396). Fig. 7 (36 
Fig. 6 (386). 
Ostrea Marshii \ nat. size. Ostrea acuminata. Terebratula digona. 
Middle and Lower Oolite. Fuller’s Earth. Nat. size. Bradford clay. 
Fig. 9 (371). Fig 8 (370.) 
Nerita costulata, Desh. Patella rugosa, Sow. 
Great Oolite. Great Oolite. 
