320 
XAUTTLOIDEA. 
Two small specimens (Xo. 3398, 3399) from Kresscnbers:, Upper 
Bavaria, agree perfectly with the present sj)ecies ; the siphuncle 
and sutures, with the inner lobe, are well seen in one of them. 
Two rolled fragments are referable to this species. They are 
from the Bed Crag of Felixstowe, but were derived from the London 
Clay. 
This species, as observed by Edwards, attained a large size. A 
large specimen (Xo. 6931) in the British M'useum (and there are 
many such) measures nearly 9 inches iti diameter. It is recorded 
by Edwards from Islington, Regent's Park, Chalk Farm, and Hyde 
Park, in the London District, and from Bognor in Sussex. 
Horizon. London Clay (Lower Eocene). Red Crag(Xewer Plio- 
cene). 
Localitits. British. Whetstone, Hornsev, near Chalk Farm, 
Potter’s Bar, Middlesex ; Isle of Shep[»ey ; coast of Essex ; Felix- 
stowe, Essex (Red Crag). — Foreujn. Kressenberg, Upper Bavaria. 
Represented in the Collection by very numerous specimens, 
including J. de C. Sowerby's figured type (Xo. 43846 in the “ Sow- 
erby Collection”). 
Nautilus urbanus, J. de C. Sowerby. 
1848, Xautihis urbanu-K, J. de C. Sowerby, Min. Couch, vol. vii. p. 36, 
pi. dcxxviii. 
1849. Xautilns urba7ius, Edwards, Mon. of the Eocene Cephalopoda 
and Univalves of England, vol. i. (Pal. Soc.), p. 46, pi. iii. fi'. 2 a, b. 
(Drawn from Sowerby's speciun-ns.) 
18o4. Xautihis urbanus, Ibctet, Traits de i*al»Sontologie, 2nd ed. 
p. 629. 
1854. Xautihis urbanus, Morris, Cat. of British Fos.<ils, 2nd ed. p. 806. 
1872. Xautilus w'hanus, Whitaker, Geology of the London Basin, 
Mem. Geol. Surv. of England and Wales, vol. iv. Appendix, p. 589. 
1890. Nautilus urbanus, Foord and G. C. Crick, Ann. Mag. Xat. 
Hist. ser. 6, vol. v. p. 391. 
Sp. Char. “ A flat discoidal shell, rounded on the ventral aspect, 
and presenting obscure undulations similar to those which charac- 
terize X. regalis. The aperture has an elongated, subquadrate 
shape ; the umbilicus is narrow ; the septa concave, and slightl)' 
undulated ; they present on each side, in a line with the preceding 
whorl, a slight depression, which appears to be the first indication 
of the lateral lobes so fully developed in the X. Farhinsoni ; the 
siphuncle is excentric, approaching the dorsal margin ; the dorsal 
lobes are short, very slightly concave, obliquely truncated, and not 
recurved. The lines of growth are prominent, and decussated more 
