CHILOGNATHA. 635 



first given, and is followed by local inflammation and fever. The 

 Centipedes of this genus live upon animal matter, and run rap- 

 idly. They grow to be five or six, and even twelve inches in 

 length. 



The ELECTRIC CENTIPEDE, GeopJiilus, (Gr. loving the ground,) 

 electricus, possesses electrical properties, giving out at night a 

 light nearly equal to that of the glow-worm. Some species of 

 this genus will live a day or two in water, and for the space 

 of two weeks, parts of the body will stir after being separated. 



The CENTIPEDE, Scutigera, (Lat. shield-bearing,) coleoptrata, 

 is widely diffused on the Eastern continent. It is found in the 

 United States, to which it is supposed to have been introduced in 

 shipping. 



Other prominent species are the LONG-HORNED CENTIPEDE, 

 (see Chart,) and the Brush-tailed Centipede, (Plate XV. fig. 18b.) 



SECOND ORDER. CHILOGNATHA, (Gr. xsifos, cheilos, a lip ; 

 yvdOos, gnaihos, a jaw ; i. e., lip formed from the jaw.) 



MILLIPEDES. 



This order includes the Millipedes, which have two pair of 

 .feet, (Plate XV. fig. 18a,) attached to each of the numerous seg- 

 mentSj and usually terminated by a simple claw. They are 

 nearly allied to the Centipedes, but the body, instead of being 

 flattened, is often cylindrical.. These animals move slowly; 

 when disturbed or at rest, they roll themselves up into the form 

 of a ball. Their eyes are composed of numerous hexagonal 

 lenses, as in the insect tribes. The spiracles or breathing holes 

 are situated behind each pair of feet. Besides these, there are 

 outlets for odoriferous glands, situated on the sides. The Milli- 

 pedes usually feed upon putrescent matter. They are included 

 in fourteen genera, with about eighty species, embraced in six 

 families. 



The GALLY-WORM, or THOUSAND- LEGGED WORM, lulus ter- 

 restris, (see Chart,) has about forty segments, to which are at- 

 tached innumerable feet, in pairs or fours. When disturbed, this 

 worm gives forth a fluid of a very disagreeable odor, from the 

 orifices on the sides of the body. 



There are five species of the genus lulus. The BORDERED 

 IULUS, /. marginatus, (Lat. bordered,) is about three inches long, 

 blackish, with a rufous border on the segments. This is com- 

 mon in the United States. 



The PILL CENTIPEDE, Glomeris, (a ball,) is a myriapode re- 

 sembling the wood louse in its form, and its habit of rolling itself 

 into a ball. 



