336 ZOOLOGY. 
spiracular openings, with no chitinous edge, this form cannot. 
be placed among the Myriopods. It is certainly not a worm, 
but, on the whole, connects the worms with the sucking 
Myriopods, and suggests that the insects may have descended 
from forms somewhat like Peripatus. Peripatus twliformis 
inhabits the West Indies, and either P. Hdwardsii Blanch- 
ard, or an undescribed species about four centimetres in 
length (with twenty-seven pairs of legs), inhabits the Isth- 
mus of Panama. The name Malacopoda was proposed by 
De Blainville, who suggested that Peripatus connected the 
Myriopods with the Annelids. 
Crass IV.—Myriopopa (Centipedes, etc.). 
Characters of Myriopoda.—The centipedes and millepedes 
are distinguished by their cylindrical body, the abdominal seg- 
ments being numerous and similar to the thoracic segments, 
all provided with a pair of feet. The head bears a pair of 
antenne, but the jaws are not homologous with those of in- 
sects. The internal organization is simple, like that of the 
larvee of insects. Some Scolopendre are said to be viviparous. 
‘Order 1. Diplopoda.—To this group belong the mille- | 
pedes, Julus, etc. (Figs. 299-302). The first maxille are 
absent. The segments are round or flattened, and the feet 
are inserted near together, the sternum being undeveloped. 
In some forms (Fig. 299, Scoterpes Coper Packard, from 
Mammoth Cave) the body is hairy. ‘They are all harmless. 
The eggs are laid in large numbers an inch or two beneath 
the surface of the earth. They undergo total segmentation, 
and in a few days the larva (Fig. 300) hatches. At this time 
it bears a resemblance to a Podura, having but three pairs 
of feet, the third pair attached to the fourth thoracic seg- 
ment. After a series of moults, new segments and new feet 
appear, and thus these Myriopods undergo a distinct meta- 
morphosis. The species feed on dead leaves and fruit. 
Order 2. Pauropoda.—The two orders of Myriopods are 
connected by Pawropus, which by Lubbock is regarded as 
the type of a distinct order (Pauropoda). Our only species, 
Pauropus Lubbockit Pack. (Fig. 304), consists of six seg- 
ments besides the head, and the young Pauwropus has but 
