XACTIL1I)*E. 
209 
Nautilus Fittoni, Sharpe. 
1836. Xavtilus compi'essus, Fittou, Trans. GeoL Soc. ser. ii. vol. iv. 
pt. ii. pp. 208 &; 367 (note). 
1853. Nautilus Fittoni, Sharpe, Description of the Fossil Remains of 
Mollusca found in the Chalk -of England (Palaeontographical 
Society), pt. i. Cephalopoda, Mon. Pal. Soc. p. 17, pi. vi. ff. 4, a-c. 
1854. Nautilus Fittoni, Morris, Catalogue of British Fossils, 2nd ed. 
p. 306. 
1862. Nautilus Fittoni, Bristow and Etheridge, Mem. Geol. Surv. of 
Great Britain — Geology of the Isle of Wight (Sheet x.), p. 137. 
1876. Nautilus of. Fittoni, Schliiter, Paloeontographica, Band xxiv. 
Lief. ii. p. 171 (51), Taf. xlvii. ff. 5, 6. 
Sp. Char. “ Shell discoidal, smooth ; sides flat, sloping ; back 
narrow and rounded, marked with a faint line along the middle ; 
umbilicus large, allowing the inner whorls to be seen, its walls 
nearly perpendicular ; aperture sagittate with the angles rounded 
off ; septa with a very tlexuous margin ; siphuncle very near the 
lower margin of the whorls. Diameter about 3 inches, breadth 
] inch. 
“ This shell has a good deal of resemblance to N. Saxhii of Morris, 
in general form, proportions, and Hex lire of the septa ; but differs 
from that species in its rounded back.” {Sharpe). 
Remarlcs. Sharpe observes that “ this species was first noticed by 
Dr. Fitton in the Tapper Greensand, Western Lines, Isle of Wight, 
and placed in the Museum of the Geological Society ; it is called in 
his lists N. compressus, which name had unfortunately been pre- 
viously applied to another species.” 
The Nautilus compressus of Sowerby, referred to by Sharpe, is 
now known as Discites compressus. 
Schliiter’s form, which, like Sharpe’s original type, is only a frag- 
ment, agrees very well with the latter in its flattened shell and in 
the abrupt curvature of the sutures near the umbilicus. 
Wifh the present species two Indian forms have, been compared, 
viz., Nautilus anrjustus, Blanford\ and Nautilus rota, Blanford^. 
Horizon. Upper Greensand. Lower Chalk. 
Localities. Warminster, Wiltshire (Upper Greensand) ; Lyme 
^ Mem. Geol. Surv. India — Palgeont. Indica — “ Fo.ssil Cephalopoda of the 
Cretaceous Rocks of Southern India,” 1861, p. 27, pi. xiv. ff. 1, 2. Ibid. 1866, 
p. 209. 
- Mem. Geol. Surv. India— Palaeont. Indica — “ Fossil Cephalopoda of the 
Cretaceous Rocks of Southern India,” 1861, p. 38, pi. xxiv. f. 3, pi. xxv. ff. 1, 2 
(not f. 3). Ibid, 1866, p. 212. 
