336 ZOOLOGY. 



spiraeular 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 th:it the insects may have descended 

 from forms somewhat like Pevipatus. Peripatus iuUformis- 

 inhabits the West Indies, and either P. Edicardsii 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. 



Cl.\ss II. — Myriopoda (Centijjedes, etc.). 



Characters of Myriopoda. — The centipedes and millepedes 

 are distinguished by their cylindrical body, tlie abdominal seg- 

 ments being numerous and similar to the thoracic segments, 

 all provided with a pair of feet. The head bears a pair of 

 antennse, but the jaws are not homologous with those of in- 

 sects. The internal organization is simple, like that of the- 

 larvae of insects. Some Scdopendrce are Siiid to be viviparous. 



Order 1. Diplopoda. — To this group belong tlie mille- 

 pedes, Julus, etc. (Fig.-J. -jgO-SO-^). The first maxillae are 

 absent. Tlie segments uro round or flattened, and the feet- 

 are inserted near together, the stenuim being undeveloped. 

 In some forms (Fig. 299, Scoterpes Copei Packard, from 

 Mammoth Cave) tlie 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 i-esemblance to a Podiira, 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. Tlie species feed on dead leaves and fruit. 



Order 2. Pauropodn. — The two orders of Mviiopods are 

 connected by Pauropiis, whicli by Lubbock is regarded as 

 the type of a distinct order (Pauropoda). Our only species, 

 Pauropiis Luihockii Pack. (Fig. 304), consists of six seg- 

 ments besides the head, and the young Pauropus has but 



