CLASSIFICATION. 341 



basipodite. At the ecdysis following the injury it is found that the lost 

 part has been formed again, in miniature, in the stump of the appendage, 

 and in succeeding moults it grows more rapidly than other parts of the 

 body. In some cases the new 'limb is precisely a repetition of the lost 

 one, but it is often found that the segmentation is different. Thus a 

 normally 5-jointed tarsus of a cockroach is often replaced by a 4-jointed 

 one.* 



The divisions of the Arthropoda adopted in the present work 

 are as follows : 



Class I. Crustacea. 



Class II. Onychophora. 



Class III. Myriapoda. 



Class IV. Insecta. 



Class V. Arachnida. 



* For further details, and reference to the literature of this subject see 

 H. H. Brindley, On certain characters of reproduced appendages in 

 Arthropoda, particularly in the Blattidae, P.Z.8., Dec. 13, 1898. 



