CONCHOLOGY. 129 



Pyramidella terebellum. Pyramidella plicata. 



P. dolabrata. P. corrugata. 



P. maculosa. 



P. dolabrata. The dentated Pyramidella. PI. 22, fig. 5. 

 Answers to the above description ; when placed on its base, 

 it falls on one side. 



P. terebellum. The wimble Pyramidella. 

 Smooth, glossy, white, with reddish-brown bands ; colu- 

 mella recurved ; inside of the lip smooth. 



FAMILY XIV. 



ScALARiDES. Three genera. 



1. Vermetus. One species. 



Resembling in appearance the shell of a Serpula ; but the 

 organization of the animal caused this to be made a distinct 

 genus. 



Its shells are usually found grouped together or inter- 

 twined with each other, and are very remarkable for being 

 attached to marine bodies by the attenuated and pointed ex- 

 tremity of the spire. 



Shell conical, tubular, thin, involute spirally, more or less 

 close, with whorls almost completely disunited; free or ad- 

 herent by intertwining ; aperture straight, circular, with edges 

 sharp and complete ; several partitions not perforated towards 

 the summit ; operculum horny and complete. 



V. lumbricales. The wormlike Vermetus. PI. 23, fig. 3. 



A flexuous shell, with a spiral, acute tip, very much resem- 

 bling a corkscrew ; colour reddish brown, sometimes clouded 

 with a darker shade. 



2. Scalaria. Seven species. 



A marine shell, with a circular aperture like the Cyclosto- 

 ma, but easily distinguished by its turreted form ; longitudinal, 

 elevated ribs, never connected together, rather oblique, and 

 sharp ; the shape of the shell is elegant, being a spiral cone, 



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