250 



SABELLARIAD^.. 



points, the central ones more prolonged than those on either side. 

 These rows of curious bristles are connected by a sort of membrane. 



No. XLIII. — Sabellaria anglica. 



Bristles of operculum. 1. Exterior. 2. Intermediate. 3. Internal. 4. Diagram 

 showing the relative ijosition of the exterior and intermediate series. 



and firmly fixed by their long shafts in the flesh ; and they are 

 moveable, at the will of the animal, in different directions, and for 

 different purposes, — but which it is ditficult to conjecture*. 

 («) Berwick Bay, Br. Johnston. 



No. XLIY. — Sabellaria crassissima. 



2. S. crassissima, opercular disk 

 with three rows of dissimilar palese, 

 the exterior palmate, with five to 

 seven digitations, the central not 

 disproportionably elongate ; bran- 

 chiae long and narrow. — Tubes 

 aggregate, erect, parallel, com- 

 posed of coarse sand cemented 

 into a mass. 



Sabella alveolata = Honeycomb 

 Sabella, Penn. Brit. Zool. iv. 

 147. pi. 92. f. 162; and edit. 

 1812, iv. 368. pi. 95. tig. sup. 

 Mont. Test. Brit. 540. 



Bristle of operculum. 



* This description does not agree with that of De Quatrefages. See loc. cit. 

 p. 15. 



