NAUTILID^. 
229 
d’Orbigny but differs in the position of its siphimcle and the 
greater size of the shell. Moreover, the examples upon which 
Nauiilus periv flatus. — a, lateral view of septate part of the shell, showing the 
small umbilicus, with a portion of the test ; b, front view, showing the 
position of the siphuncle. Drawn from a specimen in the British Museum 
(No. 18398). Bather more than one third natural size. 
d'Orbigny’s species was founded were obtained from the Kim- 
raeridge Clay of Chatelaillon, near Eochelle (Charente-Inferieure), 
Honfleur (Calvados;, and other localities, whereas the English 
specimens are from the Inferior Oolite of Bradford- Abbas, Dorset- 
shire, and Bristol. 
“ The largest specimen known to us is from the Inferior Oolite of 
Sherborne, Dorsetshire ; its greatest diameter is 8 inches and 
greatest width 6| inches. Distinct traces of the anterior border of 
the muscular impression are observable on the cast of its body- 
chamber.” {Fool'd and G. 0. Criclc.) 
The fine specimen here described now belongs to the British 
Museum (No. 3182). 
Horizon. Inferior Oolite. 
Localities. Bradford-Abbas, Sherborne, Dorsetshire ; Bristol, 
Gloucestershire. 
Well represented in the Collection. 
^ Prodr. de Paleont. Stratigr. 1850, vol. ii. p. 43 ; this species was originally 
called ivfl.atus (Paleont. Fran^., Terr. Jurass. 1842, vol. i. p. 165, pi. xxxvii.). 
