xiv A SYNOPSIS OF THE LINNEAN GENERA 



35. TEREDO.— Plate 33. 



Animal, a Terebella. 



Shell, a cylindrical tube, taper, and flexuous : two testaceous hemi- 

 spherical valves, truncated on the fore part, and wholly inde- 

 pendent of the tube, are attached to the head of the animal. 

 There are also two lanceolate valves near the tail. 



