170 
This specimen is decisive of the situation of the siphun- 
culus in the Turrilites, which before was in a similar pre- 
dicament with some of the Ammonites and the Hamites, 
see p. 135. It is perhaps wonderful that the replacing of 
the different parts of. the construction should be so partial, 
that the siphuncle can be discovered only in a very few 
instances: there are among Fossils: many other examples of 
the same nature. The probable eonstruction of the septe 
with the siphuncle is similar to that of Hamites, and from 
my experience in this subject, I think Montfort’s figure 
with a central siphuncle is incorrect, both in Turrilites and 
Baculites. The specimen here figured isa little compressed, 
being narrower one way. than. the other; it was found in 
July, 1814, in the marle stratum at Middlesham, in the 
Parish of Ringmer in Sussex,, situated about two feet below 
the surface; the Turrilites occurring in general at the depth 
of six or seven feet. 
It.is worthy of remark that this is the only species found 
at Ringmer and Stoneham, while at Hamsey, where’ the 
costata, figured at Tab. 36, and the undulata, Tab. 75, are 
met with, the tuberculata entirely disappears. 
