CLASS ir. MYRIAPODA. 113 



Lamarck arranged them with the Arachnoidea in three Genera; 

 1. Scolopendra; 2.Scutigeraj 3. Julus; and in his last work he has 

 adopted a fourth genus, Pollyxenus. 



Having given a shght sketch of what has been done by systematic 

 writers, 1 shall proceed with the arrangement proposed by Dr. Leach, 

 which differs from them merely in considering them as constituting a 

 distinct Class, and in disposing the species under some additional ge^ 

 neric heads, which a minute examination of their structure has most 

 fully warranted. 



Classification. — All the Mj/riapoda have their head distinct from 

 the body, furnished with two antenna?. Mandihles two. Maxilhe four, 

 confluent and forming a lower lip. All or most of the segments of the 

 body furnished with two or four legs. 



The nervous system is composed of a series of gangUa, one in each 

 segment of the body; these ganglia are brought into communication 

 with each other by two longitudinal bundles of nerves, or, as they are 

 generally but improperly denominated, by a spinal marrow. 



The CniLOGXATiiA and Syxgnatha, established as Families l)y La- 

 treille, are adopted as Orders by Dr. Leach. 



Order L Ciiilognatha. — Antenna seven-jointed. Legs short. Jiodi/ 

 generally crustaceous. 



Order ILSyngnatha. — ^?j^en»« composed offourteen or more joints. 

 Legs elongated. Borfy depressed, coriaceous or membranaceous. 



Order I. CHILOGNATHA, 



Fam. I. Glomerid.e. Leach, 

 Body contractile into a globe. Eyes distinct. 



Genus I. GLOMERIS. Latr., Drmer., Leach. Armadillo. Cuv. 



^«^ew7;,€ with the two first joints shortest, the sixth largest includhig 

 the last, which is very small : body elongate-ovate, convex above, 

 arched beneath; £rst segment a little semicircular lamina; the se=- 

 cond larger than the others; the last semicircular and arched; legs 

 sixteen pairs. 



Sp. 1. Glo. murginutu. Black; the margins of the segments Juteous 

 or orange. 



Oniscus marginatus. Villers, Entom. iv. 187, t. 11. f. 15. Glomeris 

 horde, Latr. Hist. Nat. des Crmt. ct, des Lisect. vii. 66. Oniscus mar- 

 ginatus. Oliv. Encycl. Mith. Hist. Nat. vi. p. 24. Julus oniscoides. 

 Tuwnsons Tracts, p. 151. Stewarfs Elem. Nat. Hist.'n. 307. Glome- 

 ris marginata. Latr. Gen. Crust, et Insect, i. 74. Lcadi, Edin. En-^ 

 cycl. vii. 407.— Trans. Linn. Soc. x\.—Supp. to Encycl Bnt. i. 43P, 

 pL2Q,~^Zool. Misc. iii. tab. 132. 



