136 BIOLOGY AND ITS MAKERS 
attracted many young men to the University of Leipsic, is 
another conspicuous personality in zodlogical progress. 
This distinguished zodlogist, following the lead of Von 
Siebold, made further modifications. He split Von Siebold’s 
group of Zodphytes into two distinct kinds of radiated animals: 
Fic. 36.—RupoipH LEuckKaRT, 1823-1898. 
the star-fishes, sea-urchins, sea-cucumbers, etc., having a 
spiny skin, he designated Echinoderma; the jelly-fishes, 
polyps, coral animals, etc., not possessing a true body cavity, 
were also united into a natural group, for which he proposed 
the name Ccelenterata. 
From all these changes there resulted the seven primary 
