136 



BIOLOGY AND ITS MAKERS 



attracted many young men to the University of Leipsic, 

 another conspicuous personality in zoological progress. 



This distinguished zoologist, following the lead of V< 

 Siebold, made further modifications. He split Von Siebold' 

 group of Zoophytes into two distinct kinds of radiated animal 



Fig. 36. — Rudolph Leuckart, 1823-1898. 



the star-fishes, sea-urchins, sea-cucumbers, etc., having 

 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 Coelenterata. 



From all these changes there resulted the seven primary 



