STRUCTURE 47 



Order V. Pauropoda. 



Body 1 2 somites, 8 of which fuse to double somites, 7 pairs of 

 legs. 1st and anal legs with 5 joints, rest 6 joints. Antennae 

 branched. No tracheae or vascular system. Ovary below gut, 

 testis above. Genital opening in 3rd somite. 



With long legs. 

 With short legs. 



Family 1. Pauropidae. 

 Family 2. Eurypauropidae. 



The Structure of the Myriapoda. 



Having now given a short view of the classification of the 

 Class, I w^ill proceed to give a general account of their structure, 

 the variations in which have led to the divisions into the various 

 Orders and Families. Their structure shows resemblances to 

 several widely different classes of animals. One cannot help 

 being impressed with their likeness to the Worms, at the same 

 time they have affinities with the Crustaceans, and still more 

 with the Insects. In the latter class the likeness of the Thy- 

 sanuridae to ScolopendreUa and Pauropus have induced a cele- 

 brated Italian anatomist. Professor Grassi, to claim the former as 

 the ancestors of the Myriapoda. 



Myriapods have a body which is segmented, as it is termed ; 

 that is, composed of a number of more or less similar parts or 

 segments joined together. 



One of the most important characteristics which distinguish 

 Myriapods from other Arthropoda is the fact that they possess 

 on the posterior segments of the body true legs which are 

 jointed and take part in locomotion. The head is in all cases 

 quite distinct from the body, and may be regarded as a number 

 of segments fused together into one mass. Their heads are 

 always provided with a single pair of antennae and mouth 

 appendages, consisting of an upper lip, a pair of mandibles or 

 jaws, and one to two pairs of maxillae. The mandibles resemble 

 those of Insects, and are strongly toothed. In the Chilognatha 

 a pair of maxillae are fused so as to form a single oval appendage. 

 In the Chilopoda they each consist of a single blade bearing a 



