1870.} 



METER— P0ETSM0T7TH LOWER TERTIARIES. 



The " Clay with Pebbles " contains — 



Cytherea despecta, Desh. A species 



new to the British Eocene. 

 Panopsea intermedia, Sow. 



corrugata, Sow* 



Pholadomya margaritacea, Sow. 

 Teredina personata, Lam. 



Pinna affinis, Sow. 

 Pecten corneus, Sow. 

 Natica labellata, Lam. 



subdepressa, More. 



Rostellaria lucida, Sow. 



And teeth of Lamna and Otodus. 



Of these species the Cytherea is found only in the zone of pebbles. 

 The Panoptece continue their range upwards from the " Sands with 

 Lingula " to a few inches (rarely a few feet) above the pebbles, all 



Fig. 2. — Beds with Panopsese in position. 



a. Stiff clay (J), h. Clay and Pebbles (H). c. Sands (G). 



species occurring with their valves united, and in their natural posi- 

 tion. It is curious that the PanopcecB should have so long outlived 

 that changed condition of the sea-bed which drove away their com- 

 rades in the " Sands with lAngula.^^ 



Cyprina planata, Sow, 

 Pecten corneus, Sow. 

 Pinna affinis. Sow. 

 Panopsea intermedia, Sow. 

 Pectunculus brevirostris. Sow., var. 



Teredina personata. Lam. 

 Pholadomya margaritacea. Sow. 

 Turritella sulcifera, Desh. 

 Natica labellata, Lam. 

 Eostellaria lucida. Sow. 



and very rarely a Nautilus occur in the " Clay with Cyprina." 

 A layer of crushed shells of Pinna, an inch or more in thickness, 



occurs at about two feet above the pebbles. The shells are so much 



decomposed that it is impossible to say whether they were whole 



when deposited. 



Aporrhais Sowerhii, Rostellaria lucida, a Chrysodomus, and several 



species of Pleurotoma occur in the sandy clay (K), which forms the 



highest Eocene stratum exposed on the works. 



* Panopma corrugata. Sow., is most plentiful in the pebble-bed. I am not 

 sure that iu the sands it can be distinguished from P. intermedia, Sow., unless 

 by a difference in size. 



