227 
SERPULA triangulata. 
TAB. DCVIII.—fig. 7. 
Spec. Cuar. Repent, roundish, elevated, smooth, 
three angles upon the back, the central one 
elevated into a keel ; lines of growth circular. 
A mvcu smaller and more cylindrical shell than the last, 
which it very nearly approaches; indeed there are upon 
the same mass of Stone several individuals so near S. tri- 
carinata that, except in size, we cannot detect a differ- 
ence. 
Brought from Bradford, Wiltshire. Upon the same 
surface are two other species of Serpula, an Exogyra? 
and portions of the Pear Encrinite. 
SERPULA runcinata. 
TAB. DCVIII.—fig. 6. 
Spec. Cuar. Repent, subtriangular, with three 
distinct serrated or lacerated keels upon its 
back ; aperture round. 
Less than a crow’s quill, tortuose, with an expanded 
base ;' the back is round, with a central and two lateral 
keels, the latter are particularly sharp and lacerated. 
Upon an unnamed Plicatula, attached to a mass of 
Coral from the Coral Rag of Shotover Hill : the upper fi- 
gure is magnified. 
