NAUTILID^. 
225 
Nautilus clausus, d’Orbigny. 
]842, Xautilus clausus, d’Orbigny, Paleontologie Fran^aise, Terr. 
Jurass. Yol. i. p. 158, pi. xxxiii. 
1849. Xautilus clausus, d’Orbigny, Prodr. de Paleont. Stratigr. vol. i. 
p. 260. 
1852. Xautilus clausus, Giebel, Fauna der Vorwelt, Band iii. Abtli. i. 
p. 155. 
1858. Xautilus clausus, Qiieustedt, Der Jura, p. 350. 
1858. Cbapuis, jSouv. Pech. sur les Foss, des Terr. 
Secondaires de la Province de Luxembourg (Acad. Roy. de Bel- 
gique, tom. xxxiii. des Mem.), pt. i. p. 14, pi. iii. f. 1. 
1860. Xautilus clausus, Wright, Quart. Journ. Geol. Soc. vol. xvi. p. 13. 
1860. Xautilus clausum, Coquand, Synop. des Foss. Secondaires de la 
Charente, de la Charente-Inferieure, et de la Dordogne, p. 9. 
1864. Xautilus clausus, Ebray, Etudes Geologiques sur le Departenient 
de la Nievre, fasc. 13, 14, p. 270. 
1868. Xautilus clausus, Dewalque, Prodrome d’une Description Geolo- 
gique de la Belgique, p. 352. 
1873. Xautilus clausus, Sharp, Quart. Journ. Geol. Soc. vol. xxix. 
p. 299. 
? 1878. Xautilus clausus, Bayle, Explication de la Carte Geologique de 
la France, vol. iv., Atlas, pi. xxxvi. 
Fig. 49. 
Nautilus clausus. — a, lateral view, showing the septate part of the shell covered 
with the test, and the cast of the body-chamber with part of the anterior 
border of the muscular impression, represented by the curved line ; h, 
peripheral view, showing some of the septa, at the lower part of the figure. 
Drawn from a specimen in the d’Orbigny Collection of the Museum of 
Natural History, Paris. About one half natural size. 
PAET II . o 
