CLASS II. MYRIAPODA. 



113 



Lamarck arranged them with the Arachnoidca in three Genera; 

 I.Scolopexdra; 2.Scuticera; 3. Julus; and in his last work he has 

 adopted a fourth genus, Pollyxexus. 



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

 writers, I 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/?'inpo(la have their head distinct from 

 the body, furnished with two antennaj. Mandibles two. MaxilLe four, 

 continent 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 ganglia, 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 Init improperly denominated, by a spinal marrow. 



The Chilognatha and Syngnatha, established as Families by La- 

 treille, are adopted as Orders by Dr. Leach. 



Order I. Chilognatha. — Antennte seven-jointed. Legs short. Body 

 generally crustaceous. 



Order IL Syngnatiia. — Jr;/e««(r composed of fourteen ormorc joints. 

 Legs elongated. Body depressed, coriaceous or membranaceous. 



Order I. CHILOGNATHA. 



Fam. T. Glomeridx. Leach. 



BotJy contractile into a globe. Eyes distinct. 



Genus I. GLO:\IERIS. Lutr., Burner., Leach. Armadillo. Cuv. 



AntenncevfiiXwhe two first joints shortest, the sixth largest including 

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

 arched beneath; first segment a little semicircular lamina; the se- 

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

 sixteen pairs. 



Sp. 1. Glu. margiiiata. Black; the margins of the segments luteous 

 or orange. 



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

 borde. Lutr. Hist. Naf. des Crust, cf des Insect. vn,66. Oniscus mar- 

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

 Townsons Tracts, j). lot. Stewart's Ekm. Nut. Hist.n. 307. Glome- 

 ris marginata. Latr. Gen. Crust, ef Insect. \. 74. I^ach, Edin. En- 

 cycl. vii. 407. — Trans. Linn. Sac. xi. — Suj^p. to Encyct. Brit. i. 430, 

 p{. Q2.~.Zool. Misc. iii. tab. 132. 



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