28 DEFINITION OF THE TERM INSECT. 
Sub-kingdom—ANNULOSA*. 
Class—INSECTA. 
First Definition—From their external Organization. 
Bopy—divided into Head—Trunk—Abdomen. 
Hrap.—Principal seat of the organs of sensation. 
Organs of sight. Immoveable eyes, simple or com- 
pound, varying in number. 
Organs of hearing uncertain, probably connected 
with the antennze. 
Organ of taste. Ligula or palate within the mouth, 
accompanied by the organs of manducation—a 
pair of mandibles and maxillee and an upper and 
lower lip, or their representatives. 
Organs of touch. Principally two jointed antennze 
or their representatives, and four jointed feelers— 
two maxillary and two labial. 
Trunk. Principal seat of the organs of motion. 
Organs of walking, running, or jumping. Six or 
eight jointed thoracic legs, in pairs. 
Organs of fight. Four wings or their representa- 
* It may not be without use to give here a short definition of the 
Annulosa ; 1 mean excluding the Vermes, which Mr. W. MacLeay 
has included; and the Annelida, which Latreille has made the fifth 
of his Annulose classes. Axn. du Mus. 1821. 
Annulosa, Animal invertebrate, oviparous; external integument of a 
firmer consistence than the internal substance, serving 
as a general point of attachment to the muscles ; eyes 
immeveable ; /egs more than four, jointed. 
CrassEs. 
1. Crustacea. Gills external ; more than eight legs. 
2. Arachnida. Gills internal ; spiracles; eight legs. 
3. Insecta, Trachee ; spiracles ; six to eight thoracic legs. 
