JOURNAL OP THE COLLEGE OP SCIENCE, IMPERIAL UNIVERSITY, 

 TOKYO, JAPAN. 

 VOL. XIX., ARTICLE 14. 



A 



Study of the Genicula of Corallinse. 



By 



K. Yendo, Rigakushi. 



With one Plate. 



INTRODUCTION. 



The genicula of the Coralîinœ are of special interest from both 

 morphological and physiological point of view. The presence or the 

 absence of a o;eniculum in Corallinaceous alçme forms the essential 

 character on which is based the division of the family into two 

 subfamilies, viz., the Coralîinœ and the Melobesiœ. 



In certain other calcareous alga3, such as Galaxaura, Actinotricliia, 

 Halimeda, Cymopolia, &c, we also find genicula of a similar appearance. 

 Although these genera are systematically apart from one another, 

 there can be no doubt that the physiological function of genicula is 

 the same in all cases. 



A comparative study of the genicula in all these members would 

 surely afford us interesting results. In the present paper, however, 

 the observation is confined to the Coralîinœ. 



As far as the present writer's observation extends, the literature 

 relating to the subject in question is comparatively scarce. Nklson 

 and Duncan jointly tried some investigations into the histology of 



1) On Some Points in the Histology of Certain Species of Corallinacese. 



