320 GLOSSARY. 



Anteorbital plate The plate, in front of the eye, in serpents. 



Antrorse Turned forwards. 



Anus The external opening of the intestines. 



Arterial bulb The muscular swelling, at the base of the great 



artery, in fishes, etc. 

 Articulated Jointed. 

 Artiodactylous Even-toed (toes 2 or 4.) 

 Attenuate Long and slender, as if drawn out. 

 Auricle The large lobe of the external ear ; also, one of the 



chambers of the heart. 

 Barbel An elongated fleshy projection, usually about the head, 



in fishes. 



Basal Pertaining to the base ; at or near the base. 

 Beak The bill of birds, or (in other animals) any beak-like 



structure. 



Bend of Wing Angle at the carpus when the wing is folded. 

 Bicolor Two-colored. 

 Booted Said of the tarsus, when its scales coalesce and form a 



continuous envelope. 



BrancJiicB Gills ; respiratory organs of fishes, etc. 

 Branchial Pertaining to the gills. 

 Branchiostegals The bony rays supporting the branchiostegal 



membranes, under the head of a fish, below the opercular 



bones, and behind the lower jaw. 

 Bristle A stiff hair, or hair-like feather. 

 Caducous Falling off early. 



Calcareous Containing or composed of carbonate of lime. 

 Canines The teeth behind the incisors the "eye-teeth"; in 



fishes, teeth in the front part of the jaws, longer than the 



others. 



Carapace The upper part of the shell of a turtle. 

 Carinate Keeled, having a ridge along the middle line. 

 Carpus The wrist. 

 Caudal Pertaining to the tail. 

 Caudal fin The fin on the tail of fishes. 

 Caudal peduncle The region between the anal and caudal fins in 



fishes. 

 Cavernous Containing cavities, either empty or filled with a 



mucous secretion. 



