t 4S ] 
F I G. LV. 
Depreffed • volutions two, round, diftant 
from each other. Free Stone 
F I G, IVI. 
BeprelTed: volutions three, a fharp ridge 
runs in the center of the upper fur,face of the 
-v.olutions. Lime Stone„ 
S E R P U L A. 
Tubular Jhell adhering to piker Jhells, 
F I G. XLV. F. 
Angular Serpula. A triangular fhell : irre¬ 
gularly twifted. 
Adheres to (in a creeping form) part of a 
Belemniie and frequently to Fig. In a recent 
Hate adheres to ftones and other fubfta.nces 
upon the coaft of Great Britain, ' (. 
ECHINUS 
