STUDIES ON CILIATED CELLS 



219 



dividing centrosome, whereas Gurwitsch ('Oi) and Wallengren 

 ('05) assert, from iheir studies of the genesis of the ciha, both 

 embryologically and after mitosis of ciUated cells, that the basal 

 corpuscles are not derived from the centrosome, but differentiate 

 in the cuticle or superficial layer of the cell-plasm, and that, 

 accordmgly, there is no reason to accept the Henneguy-Len- 

 hossek's hypothesis. 



In the present paper I intend to give an account of the 

 structure of cihated cells, their de- and regeneration, and the 

 development of cilia, an account, which would throw some light 

 on the problem above mentioned. 



II. MATERIALS AND METHODS OF INVESTIGATIONS 



An extensive comparative study being necessary, I have fixed 

 epithelia from various regions of invertebrates and vertebrates, 

 which may be tabulated as follows: 



Invertebrates 



(Anodonta 

 Limax 

 Helix 

 Gill \ 



Foot / 



Hepatic duct Helix 



Anodonta 



Vertebrates 



Oviduct 



Pharynx 



Gall-duct 



Efferent tubule of testis 



Epididymis 



Gall-duct 



Efferent tubule of testis 



Trachea 



Efferent tubule of testis) 



Epididymis . / 



[Rana temporaria 

 ) Rana esculenta 



Bufo 



Triton 



[ Trigonocephalus 



I Eliaphis 



[Lizard 



J Mouse 



[Rat 



Embryonic materials 



Ciliated infundibulum] 

 Tela chorioidea [ 



Pharynx f 



Epidermis j 



("Hyla, larvae 

 J Rhacophorus, larvae 

 \ Hynobius, larvae 

 [Rana esculenta, larvae 



