1856.] WRIGHT — UPPER LIAS SANDS. 309 



— an opinion in which I cannot concur. It is true that hthologically 

 the beds resemble each other, but palseontologically they are en- 

 tirely distinct; "the Dundry Ammonite-bed" appertains to the 

 Inferior Oolite, and represents a higher zone than the Cephalopoda- 

 bed of Frocester, Beacon, and Wotton. The prevailing Ammonites 

 at Dundry are 



Ammonites Humphriesianus, Sow. Ammonites Sowerbyii, Miller. 



Brongniartii, Sow. Blagdeni, Sow. 



Gervillii, Sow. dimorphus, d'Orh. 



Brocchii, Sow. Browni, Sow. 



I have already shown that not one of this list is found in " the 

 Cephalopoda-bed," and I am assured by my friend Mr. Ethe- 

 ridge, of the Bristol Institution, who is well acquainted with all the 

 fossils that have been and are collected at Dundry, that (with the 

 exception of A. variabilis and A. concavus, which lie at the base of 

 the bed, and a small A. hifrons from the Upper Lias Marl) not one 

 of the species of Ammonites found in the Cephalopoda-beds of Fro- 

 cester and Wotton have ever been collected at Dundry. 



The Dundry Ammonite-bed, however, does occur in Somersetshire 

 and Dorsetshire with the same species oi Ammonites, Pleurotomaria, 

 and other characteristic Dundry shells ; but in these places it occu- 

 pies a higher stratigraphical position than the Frocester Cephalo- 

 poda-bed. 



Between Yeovil and Sherborne the Cephalopoda-bed is well deve- 

 veloped, and extensively exposed ; and at the Halfway House its 

 relations to the Sands below, and the Limestone of the Inferior Oolite 

 above, may be satisfactorily made out. Here it contains a great 

 many large Ammonites, Nautili, and Belemnites, — as 



Ammonites Dorsetensis, Wright, Nautilus inomatus, d'Orb. 



n. sp. Belemnites breviformis, Voltz. 

 Jurensis, Zieten. compressus, Voltz. 



Section VI. — At Bradford Abbas, near Yeovil, Dorsetshire. 



Inferior Oolite. 



Ft. in 

 A. Coarse, hard, brown ragstone, shghtly oolitic, very irre- 

 gularly bedded, and containing few fossils : about .... 2 

 B and c. Absent. 



Cephalopoda-bed. 



D. A coarse, brown, oohtic ragstone, composed in part of hard, 

 calcareous, sandy layers, grey and brown, and having 

 softer marly sandy seams running through the rock ; it 

 breaks with an uncertain fracture, and sometimes has a 

 flinty hardness : the ragstones are speckled with dark 

 brown flattened oolitic grains of hydrate of iron, and 

 contain many fossils : about 2 6 



