CLADOPIIORA. 215 



After the species has been thus confined for some time, if 

 it be examined with a glass, very many of the filaments 

 will be found to be invested with numerous smaller fila- 

 ments. These are the young of the plant derived from the 

 growth of the zoospores, which have attached themselves to 

 the parent filaments. It was the occurrence of a specimen 

 thus infected that induced Vaucher to place this species in 

 his genus Prolifera. 



This species is the favourite resort of Diatoma vulgare^ 

 Avhich attaches itself to it by means of a distinct root-like 

 organ. The Diatoma frequently developes itself over the 

 filaments to such an extent as totally to obscure their rich 

 green colour. A brown no less rich is imparted to it by the 

 l^arasite. 



The two following plants, old and established as the one of 

 them at least would appear to be, I regard as conditions of 

 CladophoTa ghmerata — viz. C cegagroinla and C. Broitmri. 

 The microscope does not present any essential difference in 

 the structure of these supposed, though I believe erroneous, 

 species. The state of Cladophoi-a ghmerata (which has received 

 a distinct name even at the hands of the great Swede himself) 

 (^Cagagropila Linn.), I believe to be formed as follows: — 

 a specimen by the force of some mountain stream swollen by 

 recent rains becomes forced from its attachment ; as it is car- 

 ried along by the current, it is made to revolve repeatedly 

 upon itself, until at last a compact ball is formed of it, which 

 finally becomes deposited in some basin or reservoir in which 

 the stream loses itself, and in which these balls are usually 

 found. 



The size of these balls varies from two to four inches ; they 

 are dense, firm, and spongy. Kiitzing has carried his idea 

 of this species to such an extent as to constitute for its re- 

 ception a new genus, taking for the generic name the old 

 specific appellation of agagropila, and bestowing upon it the 

 specific name of its renowned discoverer Linna3us — JEga- 

 gropila Linncei. The term (pgagropUa is derived from its 

 resemblance to the balls that are found in the stomachs of 

 goats. The peculiarities of the second condition of C. gh~ 



