582 E. i;AY J.ANKESTRK. 



Fig. 2. — View of Uie ventral surface of tl»e same spccimeu crawling on a 

 glass plate and reflected in a mirror. The letters a to h indicate the " group- 

 crests " or extreme phases of forward movement, which traverse the series 

 at intervals of sixteen parapodia. 



Fig. 3. — Dorsal view of a living specimen of Scolopendra subspinipes 

 (Leach) to show the lateral undulation of the body in locomotion, and the 

 grouping of the limbs or parapodia in sixes, which are in antagonistic phases 

 on the two sides of the same segments, but identical with those on the oppo- 

 site side of the next half-group, a, c, e being in the same phase as b, d^f. 



Figs. 4 — 9. — Drawings from live specimens of Peripatus capensis to 

 show the alternate pliases of swing of the parapodia of the same side, and the 

 identity of the phase of tlie right and left pairs of one and the same segment, 

 also to show the soft-walled nature of tlie body, its pliability, and considerable 

 powers of extension and contraction. 



I should be glad were any of my readers able to inform me as to the name 

 of the author of the following appreciative lines on the subject above dis- 

 cussed. 



" A centipede was happy ! Till 

 One day a toad in fun 



Said, ' Pray which leg 

 Moves after which ?' 

 This raised her doubts to such a pitch, 

 She fell exhausted in the ditch, 

 Not knowing how to run." 



