81 
TURRILITES. 
Gen. Cuan. Shell spiral, turretted, chambered ; 
the turns contiguous, all visible. Chambers 
divided by sinuous septa, pierced in their 
disks. Aperture round. 
TURRILITES costatus. 
TAB. XXXVI. 
Spec. Cuar. Whorls of the spire beset with short 
ribs, beneath which are two rows of small 
tubercles. 
Turrilites costatus. De Montfort Journ. de Phys. 
mt eet: 1s fF. 1. 
Parkinson Org. Rem. v. 3. t. 10. f. 12. 
Someries six inches or more in length, and one and an 
half inches or more wide. 
I am much pleased that Great Britain contains even the 
cast of this rare and beautiful shell. The larger figures are 
from specimens found in Hamsey marl pit by my valuable 
correspondent, G. A. Mantell, Esq. The other which 
shows part of the septa, is from the green sand at Horn- 
ingsham in Wiltshire. JI am favoured with it by the 
intelligent Mr. William Smith. Time and attention to 
the subject may discover finer specimens; but were I to 
wait for such, I might be disappointed, or the subject 
. might be forgotten. I have never seen any more than casts 
of what I suppose to be the inside of the shell, and these 
are generally pressed into a more or less oyal form. 
