202 
NAUTILOIDEA. 
1858. Nautilus latidorsatus, Ooster, Catalogue des C^phalopodes Fos- 
siles des Alpes Suisses, pt. iii. p. 4. 
1858. Nautilus latidorsatus^ Quenstedt, I)er Jura, p. 284. 
18G4. Nautilus Toai'censis, Eudes-Deslongchamps, Etudes sur les Stages 
Juvassiques Inferieiirs de la Normandie, p. £3. 
1869. Nautilus Toarcensis, Magnaii, Etudes des Formations secondaires 
des Bords S.-O. du Plateau Central de la France, p. 61. 
1873. Nautilus latidorsatus, Sharp, Quart. Journ. Geol. Soc. vol. xxi.v. 
p. 200. 
1877. Nautilus latidorsatus, J. Buckinan, Quart. Joum. Geol. Soc. vol. 
xxxiii. p. 2. 
1880. Nautilus Toarcensis, Choffat, Etude Stratigraphique et Pal<5on- 
tologique des Terrains Jiirassiques du Portugal (Section des Tra- 
vaux Geologiques du Portugal), p. 30. 
1882. Nautilus latidorsatus, Etheridge, Quart. Journ. Geol. Soc. (Pro- 
ceedinjrs — Anniversary Address), vol. xxxviii. p. 171. 
1884. Nautilus latidorsatus, L. Mallada, Bol. Com. del Mapa Geol. de 
E.-^pana ; Sinopsis de Fosiles de Espaha, vol. xi. p. 19. (Figured 
ibid. vol. V. 1878, j.1. iii. ff. 1, 2.) 
Sp. Char. Shell much inflated, of a quarlrate form, somewhat 
flattened at the sides above the middle, and expanding just above 
the umbilicus, broadly truncated ou the periphery ; umbilicus of 
moderate size, with steeply sloping sides. Aperture wider than high. 
Septa approximate, very slightly sinuous on the sides and periphery. 
Test smooth. 
Remarls. This species is most nearly related to N. inornatus, but 
the septa are much less flexuous, the whorls proportionately wider 
transversely, and the aperture more quadrate. 
N. T'oarcemis is represented in the Collection by a specimen which 
is unfortunately without a locality, but it is probably of Continental 
origin ; most likely from France. 
Horizon. Upper Lias. 
Locality. Unknown. 
Nautilus Jourdani, Bumortier. 
1874. Nautilus Jourdani, Bumortier, Ltudes Paleontologiques sur les 
Bepots Jurassiques du Bassin du Rhone, pt. iv. (Lias Sup6rieur), 
p. 44, pi. vii. ff. 1 5. 
1889. Nautilus Jourdani, S. S. Buckman, Quart. Journ. Geol. Soc. vol. 
xlv. p. 453 (footnote). 
1890. Nautilus Jourdani, Foord and G. C. Crick, Ann. & Mag. Nat. 
Hist. ser. 6, vol. v. p. 268, f 2. 
