NAUTILIDJC. 
233 
inches in diameter) the inner lobe is very conspicuous. The 
siphuncle is a little below the centre. 
Remarlts. “ This fine species is unlike any other known to us in 
the Jurassic rocks, but it bears some resemblance to the recent 
Pig. 54. 
yuutilus Burtoncnsis. — a, lateral view, showing the laige umbilicus exposing 
the inner whorls ; b, peripheral view, showing some of the sutures where 
the test is removed. Drawn from a specimen in the British Museum (No. 
C. 2841). Somewhat less than half the natural size. 
Nautilus umhiUcatus in the character of its umbilicus, from which 
species it differs, however, in the proportionately greater size of its 
umbilicus and more flattened periphery.” (Foord and G. C. Crick.) 
Horizon. Inferior Oolite. 
Locality. Burton-Bradstock, Dorsetshire. 
AVell represented in the Collection. 
Nautilus Calloviensis, Oppel. 
P 1840. Nautilus liexayonus ?, J. de 0. Sowerby, in Grant’s ‘‘Fossils of 
Cutch’’ in Trans. Geol. Soc. ser. ii. vol. v. pt. ii. p. 329, pi. xxiii. 
f. 4. {Not of Sowerby.) 
1842. Nautilus liexayonus, d’Orbigny, Paleontologie Fran9aise, Terr. 
Jurass. vol. i. p. 161, pi. xxxv. ff. 1, 2. {Not of Sowerby.) 
1858. Nautilus Calloviensis, Oppel, Die Juraformation Englands, Frank- 
reichs und des siidwestlichen Deiitschlands, p. 547. 
1875. Nautilus Calloviensis, AVaagen, Aleni. Geol. Surv. India — Palseont. 
Indica— Jurassic Fauna of Kutch, vol. i. p. 18, pi. iii. ft‘. 2,a,b. 
