ORDER MYRIAPODA. 131 



The Polydesmi (Polydesmus, Latr.), 



Similar to tiie luli in the linear form of their body, and 

 the habit of rolling themselves spirally, but having the seg- 

 ments compressed on the lower sides, with a crest-formed 

 projection above. 



They are found on stones, and most frequently in humid 

 places.* 



The species, which have apparent eyes, form the genus 

 Craspedosome, of Dr. Leach.f 



The others have the body membranous, very soft, and 

 terminated by pencils of small scales. Their antennae are of 

 the same thickness. Such are. 



The Polyxeni (Polyxenus, Latr.), 



Which comprehend as yet but one species, classed with 

 the Scolopendra (Sc. lagura, L.), by Linnaeus, GeofFroy, 

 and Fabricius. 



It is the lulus with pencilled tail of De Geer, Insect. VII. 

 xxxvi. 1, 2, 3; Zool. Misc. cxxxv. B. Poly.venus lagurus. 

 This insect is very small, oblong, with aigrettes of small 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-rings. 



It sojourns in the clefts of walls, and under the bark of 

 old trees. 



The second family of the Myrapods, 



The Chiloi'oda (Chilopoda, Latr.), or the genus of the 



ScoLOPENDRiE (Scolopendra), of Liuna^us, 

 Have the antennae more slender towards their extremity, 



" The lulus ComplanatiiSy (Zool. Misc. cxxxv. A. j) depressiis, stigma, 

 tiidentatus of Fabricius ; his scolopendra ? dorsalis clypeata. 



+ The species, unknown before the researches of Dr. Leach, appear pe- 

 culiar to Great Britain.— See the plate cxxxiv. of his Zoological Miscel- 

 lany, Vol. III. 



K 2 



