imperfectly-defined Species of Jurassic tt'c. Nautili. 407 



We have pleasure in associating with this species the name 

 of Mr. T. G. Bayfield, of Norwich, from whose fine collection 

 of Upper-Chalk fossils all the examples of this species, now 

 in the British Museum, were derived. 



Horizon. Upper Chalk. 



Locality. Norwich. 



11. Nautilus [Hercoglossa) danicus, Schlotheira, sp. 



1820. Nautilus danicus, Schlotheini, Die Petrefactenkunde, p. 83. 



1834. Nautilus danicus, v. Buck, Neues Jahrbuch fur Mineralosrie, 

 &c. p. 533. 



1835. Nautilus danicus, Beck, Proceed. Geol. Soc. vol. ii. p. 218. 

 1837. Nautilus danicus, Lyell, Trans. Geol. Soc. vol. v. pt. i. p. 250, 



pi. xviii. figs. 4-7. 

 1837. Nautilus danicus, von Bucb, Ueber den Jura in Deutschland 



(Akad. der Wissenscb.), p. 110. 

 1850. Nautilus danicus, Geinitz, Das Quadersandsteingebirge oder 



Kreidegebirge in Deutschland, p. 110. 



1850. Nautilus danicus, d'Grbigny, Prodr. de Paleont. Stratigr. vol. ii. 

 p. 290. 



1851. Nautilus danicus, d'Orbigny, Neues Jahrbuch fur Miueralogie, 

 p. 101. 



1852. Nautilus danicus, Giebel, Fauna der Vorwelt, Band. iii. Abth. i. 

 p. 13S. 



1861. Nautilus danicus, Binkhorst, Mon. des Gasteropodes et des 



Oephalopodes de la Craie Superieur du Limbourg, pt. ii. p. 16. 

 1865. Nautilus danicus, Blanford, Mem. Geol. Surv. India, Palseont. 



Indica, Foss. Ceph. Cretaceous Rocks of S. India, p. 24, pi. x. tigs. 



4, 4 a, pi. xi. 

 1865. Nautilus danicus, Stoliczka, ibid. p. 208. 

 1868. Nautilus danicus, Dewalque, Prodrome d'une Description Geo- 



logique de la Belgique, p. 358. 

 1868. Nautilus danicus, Stoliczka, Records Geol. Surv. India, no. 2, 



p. 32. 



Fia-. 8. 



Nautilus {Hercoglossa) danicus. — Lateral view of a young example, 

 showing the curvature of the sutures. Drawn from a specimen in 

 the British Museum (no. C. 3106). Natural size. 



Sp. char. Shell subinflated, flattened on the sides, narrowly- 

 rounded on the periphery ; umbilicus closed. Septa mode- 

 rately distant, being 5 lines apart on the periphery, where 



