17 



@ 



SPIRORBIS. 



SERPULA SPIRORBIS. LtntlCBUS. 



Lister, p. 5.53, fig. 5. 

 Linnaeus has classed this with his G. Serpula, to 

 which it is nearly allied; the animal being:, however, 

 distinct, a separation is necessary. Tube testaceous, 

 turned spirally on an horizontal plane, the lower part 

 of which is attached to marine substances, generally 

 fuci; the opening of the tube terminal, and rounded 

 or angular. 



Spirorbis nautiloides Spirorbis carinata 



spirillum lamellosa 



Spirorbis tricostalis. 



SERPULA. 



SERPULA VERMICULARIS. LiniKBUS, 



Ellis Corall. tab. 38, fig. 2. 

 LinnjEus and other authors have considered this a 

 mollusca, very little importance having hitherto been 

 attached to the animals inhabiting shells. Subsequent 

 investigation has, however, proved the animal of this 

 genus to be an Annelides; the tubes are solid, cal- 

 c 



