SEGMENTATION OF ARTHROPODS 



few segments which increase as we pass from Cambrian to 

 Carboniferous genera. 



The following table shows the segmentation of the body in 

 the Malacostraea, as compared with that of Lwndus (of, p. 2G3), 

 Insecta, the primitive Myriapocl ScolopendrcUa, and Fcripatiis. 

 It will be seen that the correspondence, though not exact, is 

 very close, especially in the first four columns, the number 

 of segments in Peripatus being very variable in the different 

 species. 



The appendages of the Crustacea cxliibit a wonderful vm-iely 



