Mr. Hassall's Notices of British Freshwater Conferva. 429 



Draparnaldia condensaia. Filaments of considerable dia- 

 meter, sparingly branched ; branches furnished with cilia ; 

 cells two or three times broader than long, and usually en- 

 tirely filled with endochrome, which renders the demarca- 

 tion of the cells but little apparent. 

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



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



fish-pond, opposite Mr. Bosanquet's school for girls, in the 



parish of Wormley, Hertfordshire. 



Genus Vaucheria. 

 Vaucheria aversa. Vesicles sessile, germinate, sometimes ter- 

 nate, in form resembling a bird's head, the beak or summit 

 of each vesicle being turned in opposite directions, so that a 

 distinct horn or anther is required for each ; anther de- 

 pressed ; spores circular, not filling the entire cavity of the 

 capsule. 



I have only once met with the above species, but then in 

 considerable quantity and in great perfection. It differs from 

 Vaucheria sessilis in the form of the vesicles, and the beaks 

 are turned from and not towards each other as they are in all 

 other species. 



Vicinity of Cheshunt. 



Vaucheria polyspermia. Filaments minute ; vesicles subsessile, 

 varying in number from one to five, but usually there are 

 three ; in form the vesicles resemble an old-fashioned bill- 

 hook, their beaks are long and point in the same direction ; 

 spores circular, not filling the entire cavity of the vesicles. 

 This species, which is by no means uncommon, may be di- 

 stinguished from all others known to me by the fineness of its 

 filaments, which are not half so large as those of our other 

 British species. I at first thought that it might be identical 

 with the Vaucheria ornithocephala of Agardh, but in that spe- 

 cies the vesicles are represented to be pedunculated, and are 

 either two or four in number. 



It is remarkable to observe that in this Vaucheria there are 

 no distinct horns or anthera, the base of each vesicle before 

 its complete formation appearing to discharge the office of an 

 anther. 



Vicinity of Cheshunt. 



Vaucheria hamata (syn. Ectosperma hamata, Vaucher, Hist. 

 des Conf. d'eau douce, p. 26. pi. 11. fig. 2.). Vesicles soli- 

 tary, pedunculated, the peduncle being divided at its sum- 

 mit into two short pedicels, one of which bears the spore 

 and its capsule, the other the curved horn. 



