CONCHYLI A— D/THYi?^. 18. 55 



Shell the eighth of an inch long, and a quarter of an inch broad, 

 convex, opaque, transversely oval, obliquely truncate at the anterior 

 end, covered with a glossy white skin under which it is chalky 

 white, irregularly striate transversely ; beaks prominent, close to 

 the larger side which is abrupt; inside glossy white; hinge with 

 strong conic teeth, one in each valve penetrating into a cavity of 

 the opposite valve. 



Whether this be the shell mentioned by Montagu, as having 

 been taken among corallines, his short description will hardly allow 

 us to determine. Our specimens were taken from the inside of 

 stones dredged in Torbay, varying a little in the outline, but all 

 preserving their generic character. They have not however the 

 purple tinge, probably in consequence of their internal habitation 

 and want of light : or it is possible that an undiscovered species 

 still remains. 



18. EUYILIA—TURTON. 



Testa ovata, (equivalvis, inoequilateralis, clausa. Cardo dente unico 

 erecto inter duos minutos valvoe alterius penetrante : lateralibus 

 nullis. Ligamentum internum. 



Shell oval, equivalve, inequilateral, closed. Hinge with a single 

 erect tooth closing between two small divergent ones in the 

 opposite valve : lateral teeth none. Ligament none. 



