48 THE LIAS AMMONITES. 



Dorsetshire. — At Lyme Regis the Bucklandi series is overlain by thick beds of clay 

 and slaty marls containing many Enaliosaurian skeletons, with numerous Fishes, in fine- 

 preservation ; these strata are known to local collectors as the Fish- and Saurian-beds. 

 The magnificent specimen of Iclithyosaurus flaiyodon, Conyb., now in the British Museum,, 

 came from this clay, as proved by the impressions of Arietites semicosfatus seen on the 

 matrix. This thick clay-bed is underlain by a thin band of greyish-limestone, in which 

 Ar. Turneri is found. The following section at Lyme Regis shows the sequence of the 

 Turneri beds at that locality in a descending order. 



Section of the Zone of Arietites Turneri at Lyme Regis. 





Thick limestone, " Broad Ledge " 



Black shales, with bands of brown clay. 



" Saurian- and Fish-bed" 



Greyish, hard, shelly limestone 



Dark shales, with indurated bands of 



imperfect limestone 



Greyish limestone 



Thick- 

 ness. 



ft. in. 

 3 6 



18 

 4 



3 



Organic Remains. 



Ichthyosaurus platyodon, Conyb., /. com- 

 munis, Conyb., Arietites semicosfatus, 

 Ar. Turneri, Sow., and Fishes. 



Arietites Turneri, Sow., and Ar. semi- 

 costatus, Young and Bird. 



Lima gigantea, Sow., L. antiquafa, Sow. 

 and Bhynchonella variabilis, Schloth. 



Beds with Arietites Bucklandi and Lim.a gigantea. (See p. 38.) 



Fossils of the Zone of Arietites Turneri.^ 



Ichthyosaurus platyodon, Conyb. 

 Museum). 



— intermedius, Conyb. 



wick Museum). 



— communis, Conyh. 



Museum). 

 Arietites Turneri, Sow. 



— semicostatus, Young ^ Bird. 



— Bonnardi, (FOrb. 

 Turbo solarium, Piette. 

 Lima punctata. Sow. 



— gigantea, Sow. 



— pectinoides. Sow. 



(British 



(War- 



(British 



Cardinia oralis, Stutch. 

 Ostrea Goldfussii, Bronn. 

 Avicula insequivalvis. Sow. 

 Pecten textorius, Schloth. 



— glaber, Hehl. 

 Astarte obsoleta. Dunk. 

 Crenatula, nov. sp. 

 Plicatula spinosa. Sow. 

 Gervillia Hagenovii, Dunk. 

 Gryphaea arcuata, Lamk. 

 Cidaris Edwardsii, Wr. 

 Pseudodiadema spines. 

 Pentacrinus tuberculatus, Miller. 



' I have omitted the Lias Fishes found at Lyme Regis, as there is some doubt about the beds from- 

 which the different species were collected ; a large majority of them, however, I believe, were obtained from- 

 this zone of life. 



