Vol. 52.] OF THE CHALK ROCK. 73 



II. Class CEPHALOPODA. 



Order Nautiloidea. 



Family Nautilidse, Owen. 



Genus Nautilus (Breynius, 1732), Linnasus, 1758. 



Nautilus subl^evigatus, d'Orbigny, 1850. 



1840. Nautilus Icevigatus, A. d'Orbigny, 'Paleont. Fran?. Terr. Cret.' vol. i. 

 p. 84, pi. xvii. ; 1850. H. B. Geinitz, ' Das Quadersandsteingebirge oder Kreide- 

 gebirgeinDeutschland,' p. 110. pi. iii. f . 2 a, b ; 1853. D. Sharpe, 'Foss.Mollusca in 

 the Chalk of England,' pt. i. (Ceph.) p. 11, pi. ii. f. 1 a, b, 2a,b; 1854. J. Morris, 

 * Cat. Brit. Foss.' ed. 2, p. 307 ; 1863. A. von Strombeck, Zeitschr. der deutsch. 

 geol. Gesellsch. vol. xv. p. 136 (pars). 



1850. Nautilus subloevigatus, A. d'Orbigny, ' Prodrome de Paleont.' vol. ii. p. 189 ; 

 1859. F. J. Pictet and G. Campiche, ' Descript. des Foss. du Terr. Cret. de Sainte- 

 Croix' (Pal. Suisse, ser.i. pt. i.), p. 140; 1869. E. Favre, 'Descript. des Mollusques 

 Foss. de la Craie des Environs de Lemberg,' p. 9 ; 1872. A. Fritsch and U. Schlonbach, 

 'Ceph. bohm. Kreideformat.' p. 21, pi. xii. f. 1; 1872. H. B. Geinitz, 'Das Elbthal- 

 gebirge in Sachsen ' (Palaeontographica, vol. xx.), pt. ii. p. 182, pi. xxxii. f. 1, 1 a, 2, 3 ; 

 1873. ? A. Bedtenbacher, ' Die Ceph. der Gosauschichten ' (Abhandl. d. k. k. geol. 

 Keichsanstalt, vol. v.), p. 95, pi. xxii. f. la, b ; 1877. A. Fritsch, ' Stud, im Gebiete 

 der bohm. Kreideformat. II. Die Weissenberger und Malnitzer Schichten,' p. 101 ; 

 1883. A. Fritsch, ibid. III. ' Die Iserschichten,' p. 90 ; 1889. A. Fritsch, ibid. IV. 

 'Die Teplitzer Schichten,' p. 70; 1891. A. H. Foord, ' Cat. Foss. Ceph. Brit. Mus.' 

 part ii. p. 242; 1893. A. Fritsch, op. cit. V. ' Priesener Schichten,' p. 73. 



1852. Nautilus cre'taceus, C. G. Giebel, ' Fauna der Vorwelt,' vol. iii. p. 149 ; 

 1858. W. A. Ooster, 'Cat. Ceph. Foss. des Alpes Suisses,' pt. iii. p. 14. 



Remarks. — This species was well described by Sharpe in his 

 monograph on the Mollusca of the Chalk (1853) ; it is more closely 

 allied to Nautilus Bouchardianus, d'Orbigny, than to any other 

 species, but is easily distinguished from it by the absence of an 

 umbilicus. The largest specimen that I have seen from the Chalk 

 Rock was collected by Dr. Morison from the Luton cutting, and has 

 a diameter of 3| inches. A mandible, which probably belongs to 

 this species, was obtained by Mr. E. M. Brydone from the Chalk 

 Rock of "Winchester. 



Distribution. — British Isles: Lower Greensand; Upper, Middle, 

 and Lower Chalk. Chalk Rock of Oldborough Castle, Cuckhamsley, 

 Luton cutting, Boxmoor, Hitchin, Reed near Royston, and Under- 

 wood Hall near Dullingham. White Limestone of the North of 

 Ireland. France : zone of Epiaster brevis at Fontaine-les-Vervins, 

 zone of Inoceramus labiatus east of the Paris basin, and Middle 

 Turonian of Loir-et-Cher. D'Orbigny records it from the Chalk 

 of Martou near Rochfort, and Royan (Charente-Inferieure). Switzer- 

 land : Alpes d'Appenzell and Alpes de Schwytz. Belgium : Maes- 

 trichtian of Limbourg (according to Mourlon). Saxony. Inoc. 

 labiatus beds of Leutewitz and Briessnitz. Planer-Kalk of Strehlen 

 and Weinbohla; and the Scaphites-be&s of Zatzschke. Bohemia: 

 Turonian l and Priesen Beds of various localities, e. g. Raudnitz, 

 Teplitz. Bavaria : Kagerhoh Beds of Winzerberg, near Regens- 

 burg. Galicia : Chalk of JSTagozany. 



1 In this paper I include in the Turonian the Weissenberg, Malnitz, and 

 Teplitz Beds. 



