22 CRETACEOUS LAMELLIBRANCHIA. 



M. cor-anguinum) near Lewes. An example from Cambrai is in the d'Orbigny 

 Collection at Paris, but it is probably not the specimen figured in the ' Paleontologie 

 Francaise.' 



Distribution. — (i) Zone of Terebratulina of Bevendean, near Brighton. 1 



(ii) Zone of Holaster planus of Winchester, Lewes, Do^er, Kenley, Cuxton. 

 Chalk Rock of Boxmoor, Luton, Underwood Hall (Dullingham), Westley 

 Waterless. 



(hi) Zone of Micraster cor-testudinarium of Lewes, Dover, Purley, Strood, 

 Chatham, Swaffbam 2 (Norfolk). 



(iv) Zone of Micraster cor-anguinum of Winchester, Porton, Witherington, 

 Quidhampton, Lewes, the Sussex coast, St. Margaret's, Gravesend, Northfleet, 

 Hailing Pit (South Croydon). 



(v) Zone of Marswpites testudinarius of the coasts of Sussex, Thanet, and 

 Yorkshire. Uintacrinus band of Devizes Road, Salisbury. 



(vi) Zone of Actinocamagc quadratus of East Harnham, Hursley (Winchester), 

 the coasts of Sussex and Yorkshire. 



(vii) Zone of Belemnitella mucronata of the Dorset coast and Norwich. 



(viii) Chalk of Trimingham. 



Lima (Plagiostoma) cretacea, nom. nov. Plate IV, figs. 13, 14 a — c, 15. Plate V, 



figs, la, b, 2, 3, 4a, b. 



? 1847. Lima Mantellii, A. d'Orbigny. Pal. Franc. Terr. Cret., vol. iii, p. 568, 



pi. ccccxxvi, figs. 3 — 5 (non L. Man- 

 telli, Brongniart). 

 ? 1850. — Prodr. de Pal., vol. ii, p. 248. 



l;eviuscula, J. de C. Sowerby, in F. Dixon. Geol. Sussex, p. 347 



(p. 382, ed. 2), pi. xxviii, fig. 14, 



(non L. laeviuscula, Sowerby, 



1822). 



? 1872. Hoperi, H. B. Geinitz. Das Elbthalgeb. in Sacbsen (Palseontogra- 



pliica, vol. xx, pt. 2), p. 40, pi. ix, figs. 11,12. 

 ? 1877. A. Fritsch. Stud, im Gebiete der bobm. Kreideformat. : II, 



Weissenberg. u. Malnitz. Schicht., p. 134, 

 fig. 121. 

 ? — Mantelli, Fritsch. Ibid., p. 134, fig. 122. 



? 1888. A. Peron. L'Hist. du Terr, de Craie, p. 151. 



Description. — Shell of small convexity, oval, very inequilateral, higher than long. 

 Antero- and postero-dorsal margins nearly straight, the remainder forming a 



1 Also recorded from the Terebratulina zone of South Dorset by Dr. Barrois. 



2 This may be from the M. cor-anguinum zone. 



