217 
Nautilus obesus, J. Sowerb 3 ^ 
1816. Nautilus obesus, J. Sowerby, Min. Concb. vol. ii. p. 51, pi. cxxiy. 
1832. Nautilus obesus, Lonsdale, Trans. Geol. Soc. ser. ii. vol. iii. 
p. 273. 
1834. Nautilus obesus, Robert, Bull. Soc. Geol. cle France, vol. iv. 
p. 312. 
1842. Nautilus lineatus, d’Orbigny, Paleontologie Fran(;aise, Terr. 
Jurass. vol. i. p. 155, pi. xxxi. {not of J. Sowerby). 
1845. Nautilus obesus, Murchison, Outline of the Geology of the 
Neighbourhood of Cheltenham, new ed. p. 80. 
1852. Nautilus obesus, Giebel, Fauna der Vorwelt, Band iii. Abth. i. 
p. 165. 
1854. Nautilus obesus, Morris, Cat. British Fossils, 2nd ed. p. 307. 
1857. Nautilus obesus, Etheridge, in Mem. Geol. Surv. Great Britain : 
Hull, On the Geology of the Country around Cheltenham, p. 48. 
1860. Nautilus obesus, AVright, Quart. Journ. Geol. Soc. vol. xvi. p. 40. 
1871. Nautilus obesus, Phillips, Geology of Oxford and the Valley of 
the Thames, p. 164. 
1873. Nautilus obesus. Sharp, Quart. Journ. Geol. Soc. vol. xxix. 
pp. 294, 299. 
1879. Nautilus obesus, Stoddart, Proceed. Bristol Naturalists’ Soc. 
vol. ii. pt. iii. p. 279. 
1888. Nautilus obesus, Beeby Thompson, The Middle Lias of North- 
amptonshire, p. 54. 
1890. Nautilus obesus ?, Foord and G. C. Crick, Ann. & Mag. Nat. Hist, 
ser. 6, vol. v. p. 223, f. 5. 
1890. Nautilus obesus, Foord and G. C. Crick, Ann. & Mag. Nat. Hist, 
ser. 6, vol. v. p. 279, f. 11. 
Char. “ ‘ Gibbose, umbilicate, plain ; back broad, flat ; mouth 
large, squarish ; septa very numerous, not recurved ; siphuncle 
nearly central. . . . Thickness about three fourths the diameter. 
The mouth is large, being two thirds the diameter long. The septa 
are very numerous ; their angles not being recurved gives a very 
open form to the umbilicus. The siphuncle is transversely oval.^ 
{Sowerby.) 
Bemarlcs. “ We may add to this description that there is a specimen 
in the Woodwardian Museum from Bridport, Dorsetshire, on which 
the test remains ; it is marked only with lines of growth. This 
shell is 4 inches in diameter. 
“ This species appears to be most nearly allied to Nautilus Toar- 
censis, d’Orbigny, but the latter is readily distinguished by its much 
thicker and broader shell, larger umbilicus, and more distant 
septa. 
“ It is often a matter of very great difficulty to identify the species 
