CLASSIFICATION. 385 



symbolized their respective degrees of divergence from the 

 form of simple, undifferentiated organic matter; which we 

 may regard as their common source. Within each group, 

 the remoteness from the local centre represents, in a rough 



• . • . 



Ave* 



• ,; • Re/itUia 



VE RTEB'RATA 



• \ 

 . • - \ • 



A:n.l.kiUa \ I'^sce. ^achnida 



\ 

 \ 

 \ 



• • • 



\ ,• ,** Crustacea 



\ At ticiif a. tcL 



\ 



\ annu'losa 



\ jAnncUaa*^ 



\ ^colteida • , 



\ 'Z ••• 



\ AiTinul ol d a 



/ • 



PtcrefiCda 2 Cf/ihaU/iUa. \ Ec\uncdcTpi(ita**^ 



• • 



• ^Ga&terohcda \ .' ' 



• • diced a \ j / 



erftsterc/icdn, * PulTtlonata \ / / 



tnonaci.a. • • \ \ f 



MOLL US A \ / / 



LamtUibraTtchiaBdr—-^^ \ / / 



\Brachicficda ^ - • ^Grregari^ida 



Mollu s c oTda :Rkisc/icd<i\^^ 



^tcldinida * • * : * 'Pchjz oa /PROTOZOA 



• / . - . 



• ^ / S/icngida Jnfusflrta 



Mydrczca/* •, * * • • • 



CCEL E N TERATA 



^ctincKca* 



way, the degree of departure from the general plan of the 

 group. And the distribution of the sub-groups within each 

 group, is in most cases such that those which come nearest 

 to neighbouring groups, are those which show the nearest 



