AMITOSIS IN CILIATED CELLS ' 113 



4. The ciliated cells of the gill filaments of Cyclas reveal no 

 centrosome. 



5. These ciliated cells contain mitochondria in their cyto- 

 plasm between the nuclei and the distal borders of the cells, but 

 no genetic relation between mitochondria and cilia is discernible. 



6. Indirect evidence points to the conclusion that the basal 

 bodies of ciliated cells are centrosomal derivatives. 



I am indebted to Prof. H. E. Jordan for suggesting this prob- 

 lem to me and for assistance in the prosecution of this research. 



LITERATURE CITED 



1 Heidexhaix, M. 1907 Plasma iind Zelle, S. 284. Fisher, Jena. 



2 Hexneguy, L. F. 1898 Sur le rapports des cils vibratiles avec les centro- 



somes. Arch. d'Anat. micr., T 1 (cited from Heidenhain). 



3 Jordan, H. E. 1913 Amitosis in the epididymis of the mouse. Anat. Anz., 



Bd. 43, S. 589. 



4 Lexhossek, M. v. 1898 Uber Flimmerzellen. Verh. d. anat. Ges. zu Kiel 



(cited from Heidenhain) . 

 .5 Peck, R.H. 1877 The minute structure of the gill of lamellibranch^NIollusca. 



Quart. Jour, of Micr. Sci., vol. 17, p. 43. 

 6 Saguchi, S. 1917 Studies on ciliated cells. Jour. Morph., vol. 29, p. 217. 



