ORDER TUBTCOL/E. 
13 
over, their body has much fewer rings, and their head is dif- 
ferently ornamented. Numerous filiform tentacula, capable 
of considerable extension, surround the mouth ; and on the 
neck are gills in the form of arbuscula, and not fan-shaped. 
Linnaeus, in his twelfth edition, had given this name to an 
animal described by Kaehler, and which might belong to this 
genus, because it was supposed that it pierces stones. M. de 
Lamarck has employed this name, (An. sans Vert. p. 324.) 
for a Nereis , and for a Spio. The Terebellce of Gmelin, com- 
prehend Amphinoma , Nereides , Serpulce , &c. At the present 
day, MM. Savigny, Montagu, Lamarck, and Blainville, em- 
ploy this name as I do, and as I had proposed, Diet, des Sc. 
Nat. ii. p. 79. 
We have several of them on our coasts, a long time com- 
prehended under the name of Terebella Conckilega , Gm. 
Pall. Miscell. ix. 14 — 22, and for the most part remarkable 
for tubes formed of thick fragments of shells, and the edges of 
their aperture elongated into several small branches formed of 
the same fragments, and serving to lodge the tentacula. 
The greater number have three pairs of gills, which in those 
whose tube has branches, issue through a hole destined for 
that purpose. 
These are the simple terebellae of M. Savigny, such as Tereb . 
medusa . Sav., Eg., Annal., I. f. 3 ; Ter. cirrhata , Gm. Mull., 
Ver. xv. ; Ter. giganiea , Montagu., Linn., Trans. Nil. ii. ; 
T. Nebulosa, Id. Ibid. 12. 2. ; T. constrictor , Id. Ibid. 13. 1.; 
T. venusta ., ibid. 2. ; he also names a T. cirrhata , ibid. xii. 1., 
but which does not appear to be the same as that of Muller. 
Add T. variabilisy Hisso, &c. 
N. B. M. Savigny has two other divisions of Terebellas, his 
T. Phyzella , which have but two pairs of gills ; and his T. 
Idali(e y which have but one. Among these last would come 
Amphitrite cristata , Mull., Zool., Dan., LXX. i. 4. ; Ampli . 
ventricosa , Bose. Vers. I. vi. 4 — 6. 
