― 220 ― 



application of iodine oi potassium iodide, the outer membrane takes 

 .'slightly purplish colour, while the inner blood-reddish colour with 

 slightly purplish tinge. 



The fertile and sterile leaves may be considered as homolop-ous 

 'Orp-ans, especially so, as it is seen from the figure 2, where 3 con- 

 secutive nodes from the apex, more especially the second (Fig. 2， 2) and 

 third nodes (Fig. 2, j) carry the fertile leaves instead of the rep-ular al- 

 ternation. The case just spoken of, however, is not of usual occurrence. 



Colour of frond is chalky white with light preenish shade. 



Irlah. : On the rocks and corals near hip-h tide in calm places. 

 Riukiu. 



Remarks : The attinity of Halicoryne with Acetabulcn'ia is 

 beyond any doubt, as it is shown by the possession of the sterile and 

 fertile leaves. That the upper protuberance of the fertile leaves in 

 Halicoryne recalls the corona superior of Acdabulcu'ia has already 

 been stated above. It is interesting that Acctabularia ci'emilcda、 

 which normally produces several caps in succession above each other, 

 has the closest affinity with Halicoryne, lialicoryne, on the other 

 hand, shows an al±mity with the members of Dasycladeae by posses- 

 sion or both sorts 01 leaves, but being- distinguished irom the latter by 

 the akernatlon of those organs and character of sporangia. 



Plate XLIII. ― Fio-. 1 : fronds of HalicGvyne IVrightii Harv, 

 growing on coral, in nat. state and size. — rip*. 2 : lonpitudinal section 

 of the terminal portion of the stem ； /,^,j,^,5, fertile leaves ： well- 

 formed sterile leaves at the fourth (between j and ^) and sixth nodes 

 (between 4 and 5) trom the apex, ら，^— . ― YVg, 3 : apical portion of frond 

 of hc^. 2 ma に d.， showin?- fertile leaves at the second node, ^ ^-. — Fig. 

 4 : fully developed sterile leaf, 3;-。. 一 Fig. 5 : naked portion of stem ' 

 ay scars for the fertile leaves ； b、 those for the sterile hairs ； 一- 《 • ― Fig. 



