218 
NAUTILOIDEA. 
of Nautilus figured in the ‘ Mineral Conchology,’ owing partly to 
the brief descriptions and parti)’ to the figures being foreshortened, 
with the object of economizing space by showing as much of the 
Fig. 45. 
Nautilus ohesus. — a, lateral view of a cast, showing the septa and the open um- 
bilicus ; h, front view, showing the position of the siphuncle. Drawn from 
a specimen in the British Museum (No. 39623). Rather more than one 
third natural size. 
specimens as possible in one view. Two views at least of each 
species are essential in order to give a correct idea of the form of 
the shell. There can be little doubt, however, that the specimens 
we have, after very careful comparison, referred to N. ohesus are 
identical with Sowerby’s fossil. Though the tijpe specimen is un- 
fortunately not in the ‘ Sowerby Collection,’ there is an example 
in that collection labelled, probably by Sowerby himself, ‘ N. ohesus,^ 
which sufficiently agrees with the figure and description in the 
Min. Conch, to justify its reference thereto. Besides this individual 
there are several others both from England and France which, 
though young shells, possess unmistakably the characters of the 
present species. It is hoped that the figures here given of N. ohesus 
may help to make it recognizable. A small badly preserved speci- 
men (IS’o- 20924) from the Fuller’s Earth of Litchborough, North- 
amptonshire, most probably belongs to the present species. 
“ The only example of N. ohesus known to us which shows any 
trace of the muscular impression is a cast of a large, crushed, and 
much broken body-chamber from the Ironstone (Inferior Oolite) of 
Duston, Northamptonshire (No. 82328 6). This measures 14 inches 
