ORDER TUBICOL.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 Terehellcs of Gmelin, com- 

 prehend Amphinomce, 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 Terehella Conchilega, 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 terebellse of M. Savigny, such ^sTereh. 

 meduscB. Sav., Eg., Annal., I. f 3 ; Ter. cirrhata, Gm. Mull., 

 Ver. XV. ; Ter. gigantea, Montagu., Linn., Trans. XII. ii. ; 

 T.Nehidosa, 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. variabilis, Risso, &c. 



N.B. M. Savigny has two other divisions ofTerebellae, his 

 T. PhyzelliB, which have but two pairs of gills ; and his T. 

 Idali(B, which have but one. Among these last would come 

 Amphitrite cristata. Mull., Zool., Dan., LXX. i. 4. ; Amph. 

 ventricosa, Bosc. Vers. I. vi. 4 — 6. 



