282 



Messrs. Foord and Crick on new and 



1871. Nautilus inornatus, Phillips, Geology of Oxford and the Valley 



of the Thames, pp. 131, 104. 

 P1877. Nautilus inornatus, J. Buckruan, Quart. Journ. Geol. Soc. 



vol. xxxiii. p. 2. 

 1879. Nautilus cf. inornatus, d'Orb.,Branco, Der Untere Dogger I tenfsch- 



Lothringens (Ahh. zur geol. Specialkarte you Elsass-Lothringen), 



Band ii. Heft i. p. 57. 

 1884. Nautilus inornatus, Mallada, Bol. Corn, del Mapa Geol. de 



Espana, Sinopsis de Fosiles de Espaiia, vol. xi. p. 228 (figured ibid. 



vol. v. 1878, pi. iii. figs. 5, 0). 



Fig. 12. 



Nautilus inornatus. — a, lateral view of a cast, showing the septa and very 

 small umbilicus; b, front view, showing the siphuncle, "normal 

 line," and the septa. Drawn from a specimen in the British Mu- 

 seum (no. 0. 2848). Bather less than one half natural size. 



Sp. char. Shell inflated, smooth, slightly umbilicated, flat- 

 tened on the sides and periphery, making the section sub- 

 quadrate, the greatest thickness being just above the umbili- 

 cus. Aperture wider than high. Sutures rather flexuous on 

 the sides and curved backwards in crossing the periphery. 

 There is a small dorsal (internal) lobe. Siphuncle a little 

 above the centre. Body-chamber unknown. 



Remarks. This species most nearly resembles Nautilus 

 ohesus, J. Sowerby, but it may be readily distinguished by its 

 less robust shell, wider septa, and less open umbilicus, as 

 well as by the slightly different position of the siphuncle. 



The French specimen is a natural cast showing the sutures, 

 siphuncle, and internal lobe, but the ornamentation of the 

 inner whorl or young shell only is preserved. This consists 

 of very fine lines of growth, crossed by fine, longitudinal, 

 thread-like lines, the decussating sculpture characteristic of 

 the young of Nautilus. 



