225 
SERPULA (Vermilia?) sulcata. 
TAB. DCVIIL—/igs. 1. & 2. 
Spec. Cuar. Repent, much elevated; back and 
sides flattened ; along the centre of the back 
an irregular thick keel, and along each side a 
narrow sulcus ; lines of growth conspicuous. 
Tins Serpula seems composed of reflected scales placed 
in close succession, they are blunt and irregular; the 
aperture is round witha single tooth proceeding from 
the dorsal keel. It acquires the size of a swan’s quill. 
The lateral grooves form a prominent mark of distinc- 
tion. 
Abundant in the Calcareous Grit at Shotover Hill near 
Oxford. Part of a specimen presented by G. E. Smith, 
Esq. is represented at fig. 1. It is chiefly composed of 
Silex. Fig. 2. has more of the Shell remaining. Some 
specimens have small pores between the lamine. 
