PECTEN. 179 
published in the * Bibliographie dela France’ for June 8th, 1822, and he is inclined 
to think that it appeared somewhat earlier than Mantell’s book. 
Affinities. —P. undulatus, Nilsson,’ and I. serratus, Nilsson, are very closely 
allied to P. eretosus, but the examination of a large series of specimens could alone 
enable us to determine their exact relationships. 
Types.—The types of P. nitidus (from Lewes and Brighton) cannot be found, 
but the specimen from Gravesend figured by Sowerby is in the British Museum. 
The types of P. eretosus and P. arachnoides came from the Upper Senonian of 
Meudon. [have not seen the types, but specimens from the same locality are in the 
Wiltshire Collection, and another has been sent to me by M. A. de Grossouvre. 
Distribution.—R. Cuvieri zone of Dover. T. gracilis zone of the Dorset coast and 
Dover. HH. planus zone of the Sussex coast and Dover. M. cor-testudinariwm zone of 
the Sussex coast, Dover, Purley, and Hitchin. M. cor-anguinum zone of the Dorset 
coast, Winchester, Porton (Salisbury), the Sussex coast, St. Margaret’s, Thanet, 
Northfleet, Purley, Haling Pit (South Croydon), Bromley. Marsupites zone of 
the Dorset coast, Winchester, Witherington, the Sussex coast, and Thanet. A. 
quadratus zone of the Dorset coast, Winchester, East Harnham (Salisbury), and 
the Sussex coast. LB. mucronata zone of the Dorset coast, Clarendon and Alderbury 
(Salisbury), and Norwich. Chalk of Trimmgham. 
Proven (Cunamys) Manreniianus, @’Orbigny, 1847. Plate XXXIV, figs. 1 a,b, 
9 » 7 J 
2, 5a—c, 4—6. 
1833. Prcren concentricus, S. Woodward. Geol. Norfolk, p. 48, pl. v, figs. 
27, 28. 
1847. — Manreviuianus, A. d’Orbigny. Pal. Franc. Terr. Crét., vol. iii, 
p. 619, pl. cecexl, figs. 8—11. 
1850. — ~ — Prodr. de Pal., vol. i, p- 251. 
1854. — concentricus, J. Morris. Cat. Brit. Foss., ed. 2, p. 176. 
1870. — Manvreuuianus, F. J. Pictet and G. Campiche. Foss. Terr. Crét. 
Ste. Croix (Matér. Pal. Suisse, ser. 5), p. 215. 
1 * Petrif. Suecana’ (1827), p. 21, pl. ix, fig. 10 ; Holzapfel, “‘ Mollusk. Aachen. Kvreide” (‘ Palaon- 
tographica,’ vol. xxxv, 1889), p. 235, pl. xxvi, figs. 1, 2; Hennig, Revision af Lamell. i Nilsson's 
‘ Petrif. Suecana’ (1897), p. 48, pl. iii, figs. 9—11; Strombeck, ‘ Zeitschr. d. deutsch. geol. Gesellsch..,’ 
vol. xv (1863), p. 154; Schroder, ibid., vol. xxxiv (1882), p. 266. 
> Op. cit. (1827), p. 20, pl. ix, fig. 9; Holzapfel, op. cit. (1889), p. 236, pl. xxvi, fig. 16; Hennig, 
op. cit. (1897), p. 50, pl. iii, fig. 15; Stolley, ‘Die Kreide Schleswig-Holsteins’ (1892), p. 288; Ravn, 
‘Mollusk. i Danmarks Kridtafl.’ (1902), p. 89. 
