184 
BELOPTERA anomala. 
TAB. DXCI.—fig. 2. 
Spec. Cuar. Oblong; section trigonal ; sides very 
little expanded ; apex very obtuse, with a cir- 
cular pore on the front. 
a ROR 
Cuamserep cone very thin, filling the whole of the con- 
cave side or front of the shell, a little curved; as the 
cone diminishes, the shell increases in thickness at the 
back and sides until it terminates in a convex apex as 
broad as the base of the cone; on the front of the ter- 
mination is placed a circular hole, towards which the 
apex of the cone is curved; the shell about the base of 
the cone is very thin; the whole is smooth. 
A very curious little fossil found at the time the exca- 
vations were in progress in Highgate Hill. Only one 
individual has been discovered ; it is in a good state of 
preservation, although its chambers are filled with Py- 
rites. 
The central figure is an enlarged representation. 
