XXV111 EXPLANATION OF TERMS. 



Ichthyology. A description of fishes. 



Imbricate. Placed over each other at the edges, like the tiles 



of a house. 



Incubation. The period of a bird sitting on her eggs. 

 Larva. The grub, or caterpillar, of an insect. 

 Lateral. Belonging to the side, placed sideways. 

 Lateral line. The line which runs from the head to the tail, 



in the middle of the sides of most fishes. 

 Mandibles. The two hard pieces which form the bill of birds. 

 Migratory. Coming and going at certain intervals. 

 Multivalve. With many shells, or openings. 

 Ornithology. A description of birds. 

 Oviparous. Producing eggs. 

 Pectoral. Belonging to the breast. 

 Scapulars. The feathers on the shoulders, betwixt the wings 



of birds. 

 Shield. The small triangular spot at the back of the thorax, 



betwixt the wings of insects. 

 Testaceous. Covered with a shell, as oysters, &c. 

 Thorax. That part of the back of insects which is situated 



betwixt the head and the wings. 

 Univalve. With one shell, or opening. 

 Ventral. Belonging to the belly. 

 Viviparous. Producing young ones alive. 

 Webbed. Connected by a skin, or membrane, like the toes 



of water-birds. 

 Zoology. The history of animated nature. 



