122 



PHILOSOPHICAL NOTES ON 



epidermis, the circumambient water no doubt supplied the outer 

 layers of the cladophyl with nourishment.* 



Delesseria coriifolia has irregular or alternate budding, but 

 D. Dendroides, shown in Fig. 14, has opposite budding from its 

 midrib. The latter seaweed, in addition, affords us an adumbration 

 of the origin of nodes and internodes. Cladhyinenia conferta, 

 shown in Fig. 15, has a winged stem and branches throughout 

 with irregular budding. 



Fig. 14. Delesseria Dendroides 

 ("Harv. Phyc. Austr.," pi. 137)— 

 part of cladophyl. 



Fig. 15. Cladhymenia conferta 



(" Harv. Phyc. Austr.," pi. 144)— 



winged branches or cladophyls. 



Another seaweed, Fig. 16, without having apparently a trace 

 of midrib, shows that the margin of the seaweed cladophyl is 

 equal, as far as budding is concerned, to the midrib. It is in fact, 

 a flattened midrib. It also shows us how leaflets, lobes, teeth, and 

 ovules of phsenogams may have originated. Z>' Urvillea potatorum 

 (" Harv. Phyc. Austr.," pi. 300) has a similar structure. It is, 

 however, many fathoms long, and broad in proportion, and its 

 fertile fronds are studded with conceptacles. Of a like structure is 

 Phyllospora comosa (pi. 153, Op. Cit.). 



♦ Under the heading of " Fibro-vascular system," I have endeav cured to 

 account for its genesis by a somewhat novel hypothesis. 



