HI. J. Clark on Polarity and Polycephalism. 73 
the genitalia from a direct relation to the general mass, or even 
to the hydre in particular, whilst a consentaneous development 
a — region of its periphery to a tentacular, prehensile 
office, 
_ Step by step, however, all the elements of a complete organ- 
ism are successively absorbed out of the primitive hydra-mass, 
and remodelled into the fashion of a medusoid; the reproduc- 
tive character has become a less obtrusive feature; motion at- 
ts attention above all others; prehension has full sway in 
the highly developed tentacles; and the latter point, like fin- 
gers, to the self-sustaining power of the acalephan morph in the 
complete organization of th itudi ife 
rous channels, opening into the receptive cavity of a highly flexi- 
| h, the 
hydroid cephalism and the medusoid cephalism. Suchisthecon- — 
dition at which the hydromedusariz of Corymorpha, Hyboco- 
would seem so, according to the advocates of individualism ; 
ants 
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