STRUCTURE AND CLASSIFICATION OF THE AllTHKOPODA. 523 



The Structure and Classification of the 

 Arthropoda. 



By 

 E. Ray Lankcster, ITI.A., LiL.D., F.R.S., 



Director of tlie Natural History Departmeuls of the British Museum. 



With Plate 42. 



[By tlie great kindness of the proprietors of the tenth edi- 

 tion of the 'Encyclopasdia Britaunica' I have received per- 

 mission to reprint in this journal the articles Arthropoda 

 and Arachnida, which I contributed to its pages. I have 

 been anxious that morphologists should consider the views 

 which I have put forward in these articles (written now nearly 

 four years ago). At tlie same time I have observed that they 

 have entirely escaped the notice of two authors who have 

 recently written general essays on the Arthropoda, viz. Dr. 

 A. S. Packard, of Salem, Mass., and Mr. G. H. Carpenter, 

 of Dublin. I have revised both articles only in regard to 

 verbal inaccuracies, excepting where I have definitely stated 

 that new matter is introduced. I hope that in their present 

 form these ai'ticles will not fail to come under the notice of 

 zoologists. — E. R. L.] 



Arthropoda is the name of one of the three sub-phyla 

 into which one of the great phyla (or primary branches) of 



