368 
NAUTILOIDEA. 
The specimen here figured (fig. 78, a-c) is remarkable for the 
brevity of the posterior portion ; in other respects it is like the 
Trench specimen. 
Referring to figure 78 (d-g) it may be mentioned that there are 
several examples in the Collection of a narrower and sharper form 
of (upper) mandible, also from the Lias of Lyme llegis, which pro- 
bably belonged to a different species of ^"^autilus (?) to the one here 
figured k 
CRETACEOUS. 
Fig. 79. 
a, lateral view of an upper mandible, showing at h, h remains of the horny 
lamina converted into carbonaceous matter ; b, lateral view of a smaller 
upper mandible of narrower and more pointed form than a; c, view of 
the outer side of the same ; d, inner side of an upper mandible. All from 
the Gault of Folkestone. The specimens figured are numbered C. 842 a, 
h, c, in the Collection, and are drawn natural size, e, view of the outer 
side of an upper mandible ; /, lateral view of the same ; g, inner side of 
the same showing the strong median keel, seen also in/. 
Uemarhs. The specimen lettered e-g appears to be the Rhyncho- 
teuthis quinquecarinatiis of Pictet aud Campiche It differs from 
the Gault and Chalk mandibles in its extremely robust form, and in 
^ See the specimens numbered 35053, 37288, and 46490. 
^ Terrain Cretace de Sainte-Croix, 1862, ser. iii. p. 161, pi. lix. fig. 9, a-c. 
