18 



careous, irregularly twisted; aperture terminal, round- 

 ed, and smooth; fixed at the lower extremity, or more 

 or less completely adhering by other parts to marine 

 substances. It is found solitary, or in groups curiously 

 intertwined. 



Serpula vermicularis 



Serpula Alalia 



fascicularis 



pellucida 



intestinum 



intorta 



contortnplicata 



cristata 



plicaria 



spirulaea 



glomerata 



quadrangularis 



decussata 



minima 



protensa 



echinata 



infundibulum 



sulcata 



annulata 



costalis 



cereolus 



dentifera 



filograna 



sipho 



vermicella 



arenana. 



VERMILIA. 



SERPULA TRIQUETRA. — LiniMEUS. 



Born, p. 436, *. 18, fig. 14. 

 This, like the preceding gem* bas been confounded 



