76 HALIOTIS. VERMETUS. SCALARTA. 



elegantly formed, if the plate I have seen of it 

 be correct. 



'* There is a number of fine specimens in the 

 British Museum. 



" The family PUcacea contains only, 



Tornatella Valvata, chiefly. 



Pyramidella. 



" All the species have plaits, or folds, on the 

 columella. The shells are marine and foreign 

 in both genera. (Plate 9.) 



" Our next family, Scalariana, contains the 

 genera 



Vermetiis. 



Scalaria Tnrho. 



Delphinula Turho. 



" The single species of the first genus, Ver- 

 metiis linnhricaUs^ inhabits the sea near to Sene- 

 gal. The shell is tubular, thin, twisted spirally ; 

 it is fixed on marine substances by the end of 

 its thin, pointed spire. The shells are usually 

 found in groups. 



" The genus Scalaria is one of the most ele- 

 gant among univalve shells. The singularity 

 of the numerous ribs renders the shells easily 

 known from all other pjenera o^ XwxxetedMollusca. 



