bust species of Cladophora, of the division to which C. pelhicida 

 belongs. But a closer examination reveals characters which 

 force us to remove it far from Cladophora, and to associate it 

 with the small group of confervoid Algse which is typified by 

 Valonia. These characters are, — the branching fibrils that issue 

 from the base of the first-formed cell ; the annular constrictions 

 of the cells, both primary and those afterwards formed ; the de- 

 position of carbonate of lime, as a superficial coating ; the watery 

 contents of the cells ; and, finally, the mode of development. 



Among Australian Algse Jpjoftnia will stand next to Struvea, 

 from which it is distinguished by the dendroid or umbellate 

 habit, and the non-anastomosis of the branches of its crown. 

 The substance and mode of development are similar. It is 

 more closely allied to the West Indian Chamcedoris, with which 

 it nearly agrees in technical character, but the habit is so dis- 

 similar, that I have not hesitated to separate them. In Chamce- 

 doris the tubular stipes is headed by a dense mop-like capitulum 

 of dichotomous filaments, closely interwoven, and whose articu- 

 lations are filiform, without annular constrictions : the stipes and 

 root and mode of development are as in Apjolinia. 



My earliest specimens were collected at Port Fairy. I after- 

 wards obtained much more perfect ones at Philip Island, and 

 more recently still received from Mr. Wilhelmi a specimen from 

 Port Lincoln. The range of the species therefore is probably 

 greater, perhaps extending along the whole southern coast. 



Fig. 1. Apjohnia l^tevirens, — the natural size. 2. Base of a stipes, to show 

 its roots and the annular constrictions of the tube. 3. Apex of a young 

 stipes, after the formation of the axial cellule. 4. Another apex, showing 

 the commencement of the umbellate branches. 5. Apex of a full-grown 

 trichotomous branch : — the latter figures magnified. 



