xiv A SYNOPSIS OF THE LINNEAN GENERA. 



35. TEREDO. Plate 38. 

 Animal, a Terebella. 



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

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

 dent of the tube, are attached to the head of the animal. There 

 are also two lanceolate valves near the tail. 



