1908] YAMANOUCHI— SPERMATOGENESIS AND OOGENESIS 163 



published, according to which the blepharoplast has nothing to do 



mitosis 



simply lies near the pole of the spindle. He does not regard the 

 blepharoplast as a centrosome. 



Belajeff's conclusions (7) in reference to Marsilia oppose those 

 of Shaw; for he believes that the blepharoplast always occupies the 



pol 



claims that the hlepharop 



the centrosome. He fisrures 



He 



mother 



centrc^omes 



certain 



animal cells. 



Ikeno (45) considers the blepharoplast of ]Marchantia to be actu- 

 ally a centrosome, as shown by its behavior during mitosis. He 

 homalogizes the Nebenkorper^ the deeply staining body in the cjrto- 

 plasm of the spermatid, with the blepharoplastoid of Shaw. ' Again 

 he (46) discusses the homologous nature of the blepharoplast and 

 centrosome in his paper entitled " Blepharoplasten im Pflanzenreich." 

 The Nehenkern of Belajeff, he suggests, is homologous with the 

 deeply staining body (the Korperchen) m the spermatid of animals. 

 Last year Ikeno (47) reasserted his belief that the blepharoplast is a 

 centrosome. He thinks that the bodies now called blepharoplasts 

 day not all be homologous structures, but he holds that the blepharo- 

 plasts of pteridophytes, gj^mnosperms, liverworts, and myxomycetes 

 are of centrosome origin either ontogenetically or phylogenetically. 



The foregoing accounts of Ikeno confirm Belajeff's view regard- 

 ing the homolog}^ of centrosome and blepharoplast. Str.vsburger 

 (87) wrote at length on this subject seven years ago, and docs not 

 accept Belajeff's view. He emphasizes the kinoplasmic character 

 of the blepharoplast, whether it be a differentiated region of the 

 plasma (as he believes for the zoospores of Vaucheria, Cladophora, 

 ^^d Oedogonium), or a special development in the interior of the 

 cytoplasm (pteridophytes and g}Tnno3perm5). He thinks that all kino- 

 plasmic structures, be they centrosomes, centrospheres, or blepharo- 

 plasts, hold a ver}' clc^e physiological relation to the structure of 

 the nucleolus, so that the blepharoplast might occupy the positian 



