2 NOTES ON MILLIPEDES. 



II. Position in the Animal Kingdom. 



Millipedes, centipedes, scorpions and spiders all belong to 

 the great collection of invertebrate animals with jointed legs 

 which is for convenience grouped together and called the 

 Sub-kingdom ARTHROPODA(or GNATHOPODA). Various opinions 

 are held by naturalists as to the divisions into which this Sub- 

 kingdom should be divided. Valuable papers on the subject ap- 

 peared in "Natural Science" in 1897, by Mr. R. J. Pocock in 

 the February number (p. 114), and by Prof. Ray Lank ester in 

 the April number (p. 267); from these the following provisional 

 classification is adopted. 



Sub-kingdom Arthropoda. 



SECTION I. Prototracheata (or Malacopoda). 



Class (i). Prototracheata (or Peripatoidea). 



Containing the single family Peripatidae, now divided 

 into about four genera. A single specimen is on record 

 from Sumatra, and Mr. H. N. Ridley informs me that 

 the Skeat expedition recently obtained it in the Malay 

 Peninsula. This very interesting animal has somewhat 

 the general external appearance of a caterpillar, it has 

 a pair of antennae, and in the Sumatran specimen 24 

 pairs of legs (t. Sedgwick, Cambridge Nat. Hist., vol. 

 v, 1895, p. 2G). 



SECTION II. Tracheata (or Lipobranchia). 



Subdivision A. — Progoneata (or Prosthogonea). 

 Class (ii). Biplopoda. " Millipedes " (vide post). 

 Class (hi). Pauropoda. Containing the single family 



Pauropidae. 



Minute creatures with twelve body segments and 



branched antennae ; which I believe have not so far 



been found in Malaya. 

 Class (iv). Symphyla. Containing the single family 



Scolopendrellidae (vide post). 

 Subdivision B. — Opisthogoneata (or Opisthogonea). 

 Class (v). Chilopoda. " Centipedes" (vide post). 



