122 CHiETOniOREiE. 



3. Draparnaldia repetita Hass. 

 Plate XII. Fig. 2. 



Char. Filaments branched, consisting of repeated series of cells, 

 each series composed of Jive or six cells, which decrease in 

 size from the first or loioer cell to the last or upper one, 

 Tufts dense, alternate. 



Hassall, in Annals of Nat. Hist., August, 1842 ; also in 

 loc. cit. vol. xi. 428. 



Hab. Cheshunt : A. H. H. 



" I have only once met with the above species, and then 

 but in small quantity : it is therefore no less rare than it is 

 curious. Each series of cells is an epitome of the entire plant, 

 which consists but of an aggregation of such series. A 

 sketch of it was forwarded to Dr. Greville, who did not hesi- 

 tate to agree with myself in the opinion of its distinctness." 



4. Draparnaldia condensata ^as^. 



Plate XI. Fig. 1. 



Char. Filaments of considerable size, sparingly branched. 

 Branches /(!«'?t/i'^c(Z xcith short cilia. Cells abbreviated. 



Hassall, in Annals of Nat. Hist. vol. xi. p. 429. 



This is one of the finest and most distinct species of the 

 genus. The only locality at present known for it is a large 

 fish pond opposite Mr. Bosanquet's school for gu'ls in the 

 parish of Wormly, Hertfordshire. It differs from the two 

 preceding species in several respects. It is more sparingly 

 branched, the ramuli are never tufted, and the cilia rarely 

 prolonged: the cells are very short, usually broader than 

 long, and entirely filled with endochrome. The habit of the 

 plant is also dilTerent, dwelling in water less fresh, and its 

 colour in consequence is less vivid than in most other Dra~ 

 parnaldicB. 



