50 
SERPULA flagelliformis. 
TAB. DCXXXIY .—Jig. 2 Sc 3. 
Spec. Char. Attached by its whole length ; tor- 
tuous, increasing very gradually towards the 
mouth ; shell thin, smooth, with slightly raised 
annular undulations ; mouth round, its dia- 
meter half a line. 
Syn. Yermilia flagelliformis, Morris , Catal. 67. 
f ound attached to shells in the sandy beds of the London 
clay in Bracklesham Bay, by F. E. Edwards, Esq. It is 
one of the most simply formed species we know, and differs 
from the recent A. vermicularis , Linn., in the total absence 
of a keel. A Serpula occurs in the crag which only differs 
in being rather larger than the biggest specimen (fig. 2.) 
from the clay. 
SERPULA exigua. 
TAB. DCXXXIV — fig. 4. 
Spec. Char. Attached throughout, involute, dis- 
coid, smooth, minute ; tube depressed, en- 
larging gradually towards the aperture, which 
is transversely elongated ; lines of growth 
oblique. 
Attached to a small Natica found at Barton by Mr. Ed- 
wards. 
