102 
Fig. 12 (363). 
Belemnites Puzosianus, 
"Orb. 
Oxford clay, Christian Malford. 
a, a. projecting processes of the 
shell or phragmocone, 
4, c. broken exterior of a conical 
shell called the phragmo- 
cone, which is chambered 
within, or composed of a 
series of shallow concave 
cells pierced by a siph- 
uncle. 
e,d. The guard or osselet, 
which is commonly called 
the belemuite, 
Geology of Wiltshire. 
of both kinds have been found very perfect — 
where the clay is fine and seems to have 
quietly enveloped them. They retain the 
delicate elongated processes, which generally 
are wanting. An example of each is given 
below from Sir C. Lyell’s Manual. The 
large development of the upper shell of the 
Belemnite, in which the animal (an extinct 
kind of cuttle-fish) lived, is particularly 
remarkable. There are few fossils probably 
more generally known to my readers than 
the Belemnite, (vulgarly called thunderbolt.) 
It must be interesting to them to know the 
kind of animal to which they belonged. Pro- 
bably the use of the spike at the bottom was, 
being weighted, to keep the whole shell in a 
vertical position while floating in mid water. 
Fig. 11 (362). 
c 
pe 
py I 
yes = 
Ammonites Jason, Reinecke. Syn. A. Elizabethe, Pratt. 
Oxford clay, Christian Malford, Wiltshire. 
The Oxford clay is overlapped on the east 
by beds of a calcareous grit, or sandstone, 
and sandy beds, which, with the overlying 
strata of a ragged and crystalline limestone 
