HANDBOOK OF SHELLS. 55 



beak, the apex of which is perforated. The Terebratulida are 

 the most extensive family of this class. 



Fi.r. 2T. Teredo navalis. 



HOW TO ARRANGE THE SHELLS IN THE 

 CABINET. 



When you have arranged your specimens in the order above 

 indicated, proceed to place them in your boxes, arranging and 

 labelling them after the manner shown in the accompanying 

 diagram. 



