EXPLANATION 



TERMS USED IN NATURAL HISTORY. 



Abdomen. The part of the body containing the organs of diges- 

 tion. 



Abdominal. Pertaining to the abdomen. 



Amphibious. Capable of living both on the land and in the water. 



Animalcules. Small animals, visible only with the assistance of the 

 microscope. 



Annulated. Marked with rings. 



Antennae. The horns or feelers of insects. 



Apex. The top or summit of anything. 



Apical. Situated at, or belonging to, the apex. 



Apodal. Footless. 



Apterous. Wingless. 



Aquatic. Living or growing in the water. 



Bicuspid. Having two points. 



Bifid. Divided into two parts. 



Bifurcated. Divided into two prongs. 



Bisulcous. Cloven-hoofed. 



Bivalve. With two shells. 



Bronchia. Gills, or organs for aquatic respiration. 



Buccal. Pertaining to the mouth. 



Byssus. A tuft of silky filaments produced by some Molluscs. 



Callosity. A hard lump, an excrescence. 



Campanulate. Bell-shaped. 



Canine. Of the dog kind. 



Carinated. Keeled. 



Carnivorous. Feeding on flesh. 



Caudal. Pertaining to the tail. 



Cere. A skin over the base of the bill of birds. 



