MYRIAPODA. 251 



POLYDESMUS, Lat. 



The Polydesmi resemble the Iuli in the linear form of their body, 

 and the spiral manner in which they roll up their body; but the seg- 

 ments are compressed on the inferior sides, and have a projecting 

 ridge above. They are found on stones, and most commonly in wet 

 places(l). 



The species with apparent eyes form the genus Craspedosoma of 

 Leach(2). 



The others have a very soft, membranous body, terminated by 

 pencils of little scales. Their antennae are equal. Such is the 



POLLYXENUS, Lat., 



Which as yet comprises but a single species, placed among the 

 Scolopendrae Sc.lagara, L., by Linnaeus, Geoffroy and Fabricius. 

 It is the Iule a queue en pinceau of De Geer, Insect., VII, 

 xxxvi, 1, 2, 3? Zool. Miscel., cxxxv, B. Very small, oblong, 

 with bunches of little scales on the sides, and a white pencil at 

 the posterior extremity of the body. It has twelve pairs of feet 

 placed on as many semi-annuli. Inhabits cracks in walls, and 

 under pieces of bark(3). 



FAMILY II. 



CHILOPODA(4). 



The antennae of the Chilopoda are more slender towards the 

 extremity, and consist of fourteen joints and upwards ; their 

 mouth is composed of two mandibles furnished with a little 

 palpiform appendage, which seem to have been soldered in 

 the middle, and terminate like the bowl of a spoon with den- 



(1) The Iuli complanatus ('Zool. Miscell. CXXXV, A), depressa, stigma, triden- 

 tatus, Fab.; his Scolopendrx? dorsalis and clypeata. [Amer. species, P. serralus, 

 granulatus, Say, and the lulus virginiensis, Drury. Am. Ed.] 



(2) The species, unknown before Leach, appear to be proper to England. See 

 pi. exxxiv of his Zoological Miscellany, vol. III. 



(3) There is a second species, P. fasciculatus, Say, that inhabits the southern 

 section of the United States. See Journ. Ac. Nat. Sc. of Phil. II, part I, p. 108. 

 Am. Ed. 



(4) Chiiopoda, Lat. or the genus Scolopendra, Lin. &c. 



