201 



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,i\ie orifice or opening of the shell; it is called an- 

 gular, when its circumference has several angles: 6?- 

 marginated, when the right lip forms a double 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 : trans- 

 verse, when the bi'cadth is greater than the length. 



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 applied 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. 



