210 



Pyramidella terebellum Pyramidella plicata 



dolabrata corrugata 



Pyramidella maculosa. 



VERMETUS. 



SERPULA LUMBRICALIS. LinilCBUS. 



Mawes Linn. pi. 34,/. 1. 

 At the first sight of this shell it might be considered 

 the production of an Annelide, or the shell of a Serpu- 

 la; but the figure and description given of the animal 

 by Adanson, evidently prove it to be a true Mollusca, 

 and very singular in its organization, since it cannot 

 displace itself to climb or swim from one place to ano- 

 ther. The shell is tubular, thin, diaphanous, almost hor- 

 ny, and turned in a loose spiral form, particularly at 

 the posterior end; it is rendered extremely remarkable 

 from the circumstance of its adhering, or being affixed 

 to marine bodies by the attenuated and pointed extre- 

 mity of the spire. These shells are usually found 

 grouped together, and as it were intertwined with each 

 other: they appear nearly allied to the shells of the G. 

 Scalaria, which are rendered tubular by the peculiar 

 separation of the whorls of the spire, though they are 

 free, and never attached by any part to marine bodies. 



Vermctus lumbricalis. 



