INOCERAMUS. 



291 



Types. — The specimen figured by Mantellas I. Brongniarti var., from the Upper 

 Chalk (probably zone of Micraster cor-anguinum) of Southeram (Lewes), and the 

 one figured as Inoceramus sp. by the same author from Lewes, and /. Lamarclci, 

 Sowerby (in Dixon), from the Chalk, Sussex (probably zone of Terebrahdina 

 lata of Mailing), are in the British Museum, Nos. 5878, 4765, L20955 respectively. 





Fig. .50 — Inoceramus inconstans, sp. nov. mi-. Senonian, Haldon. British Museum, No. L17380. Left valve. 

 A large flat form resembling /. cycloides, Wegner. Compare with Fig. 46. x f . 



Distribution. — Zone of Holaster planus of Twyford, Swaffham (Norfolk), and 

 Strood. Zone of Micraster cor-testudinarium of Chatham, Guilford Colliery 

 (Coldred near Dover), and Wharram (Yorkshire). Zone of Micraster cor-anguinum 

 of Southeram (Lewes). Zone of Actinocamax quadratics of East Harnham 

 (Salisbury) and Brighton. Zone of Belemnitella mucronata of Shide (Isle of 

 Wight). Probably also in the zone of Terebratidina lata. 



