GLOSSARY 



TERMS USED IN CONCHOLOGY. 



Acuminated, terminated in a sharp point. 



Anterior, (in Univalves) the part which forms the spire : 

 (in Bivalves), see Margin. 



Aperture, the orifice or opening of the shell; it is called 

 angular, when its circumference has several angles : bi- 

 marginated, when the right lip forms a douhle margin : 

 coarctate, contracted: compressed, flattened: gaping, 

 when one of the extremities is wider than the other : 

 linear, when narrow, and the length greatly exceeds the 

 breadth : tra?isverse, when the breadth is greater than 

 the length. (These terms are applied to Univalves). 



Apex, the tip or small end of a shell. 



Articulated, (applied to Multivalves), when the different 

 pieces of which the shell is composed are so strongly 

 united, that they appear to form one shell: (when ap- 

 plied to Bivalves), see Teeth. 



Auriculated, having ears. 



Base, (applied to Multivalves), the part on which the shell 

 is supported : (to Univalves), the most elevated part of 

 the shell, opposite to the spire. 



Beak, Beaked, having the extremity of the base of the 

 shell elongated and contracted in the form of a beak. 



