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TEXT-BOOK OF ENTOMOLOGY 



(Fig. 13) approaching nearest to our idea of the ancestral niyriopod, 

 which might provisionally be named Protopauropus. 



Relations of the Symphyla to Insects. Opinions respecting the 

 position of the Symphyla, represented by Scolopendrella (Fig. 14), 

 are very discordant. By most writers since Newport, Scolopen- 

 drella has been placed among the myrio- 

 pods. The first author, however, to examine 

 its internal anatomy was Menge (1851), who 

 discovered among other structures (tracheae, 



FIG. 13. Pauropus huxleyi, much enlarged. A, enlarged view of head, antenna, and first 

 pair of legs (original). , young. After Lubbock. (7, longitudinal section of Pauropus huxleyi, J 1 : 

 a, brain ; b, salivary gland ; k, mid-intestine ; ff, rectum ; h, ventral nerve-cord ; c,, bud-like rem- 

 nants of coxae ; d, penis ; e, vesicula seminalis ; /, ductus glandularis ; i 1 , divisions of testes. After 

 Kenyon. 



etc.) the silk-glands situated in the last two segments, and which 

 open at the end of each cercus. He regarded the form as "the 

 type of a genus or family intermediate between the hexapod 

 Lepismidae and the Scolopendridse." 



In 1873 x the writer referred to this form as follows : " It may 

 be regarded as a connecting link between the Thysanura and Myrio- 

 1 Proc. Bost. Soc. Nat. Hist., xvi, 1873, p. 3. 



