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XI Descriptions of five British Species of the Genus Terebella 
of Linné. By the late George Montagu, Esq. F.L.S. Commu- 
nicated by William Elford Leach, M.D. F.R.S. and L.S. 
Read March 4, 1817. 
TEREBEL. A. 
Gen. Cuar. Body long and annulated, furnished on each side 
with pedunculated feet terminated with bristles, which are 
retractile: head with numerous long simple capillary appen- 
dages: three small ramified branchiæ on each side behind 
the head. l 
The animals of this genus either prepare a sheath from the te- 
nacious secretion of their- bodies mixed with adventitious matter, 
or reside in prepared perforations at the bottom of the sea. The 
tubes which are prepared by them are in general so extremely 
delicate, that they are very easily destroyed, and they are then 
found lurking beneath stones, or forming a new habitation by 
connecting together sand or mud with the slimy secretion of their 
bodies. Some species form a tube in old shells or stones, to 
which they adhere by the whole length; others fix a tube per- ` 
pendicularly in the sand, with two or three inches projecting 
above the surface. Many are gregarious, and so numerous, that 
we have seen the shore covered with the fragments of théir tubes 
after 
