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



greatly rounded caudal, and a much more slender head than 

 that of vittatus. This plate is probably a representation of 

 a fish procured by MM. Quoy and Gaimard at Port Western 

 in New Holland, and unless the artist has erred in the form of 

 the dorsal and caudal, it can scarcely be the same with Forster's 

 puUus, and is still more evidently distinct from Solander's 

 vittatus. 



[To be continued.] 



LX. — Descriptions of British Freshwater Conferva, mostly 

 new, ivith observations on some of the Genera. By Arthur 

 Hill Hassall, Esq. 



Genus Draparxaldia. 

 Draparnaldia repetita. Filaments branched, consisting of a 

 repeated series of cells, each of which is composed of hve or 

 six cells or utricles which gradually decrease in size from the 

 first or lower cell, which is rounded below, to the last or 

 upper one ; a tuft of minutely divided filaments, similar to 

 those of other Draparnaldice, arises from the superior cell of 

 the series usually only on one side, but sometimes on both ; 

 the different series are not placed in a straight line imme- 

 diately above each other, but are arranged somewhat in a 

 zigzag or waved manner. 



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 these series. A sketch of it 

 was forwarded to Dr. Greville, who did not hesitate to agree 

 with myself in the opinion of its distinctness. 



Draparnaldia elongata. Filaments very slender, cihated ; cells 

 fasciated, usually three times as long as broad. 

 I once met with a considerable quantity of the above spe- 

 cies in a horse-trough near Cheshunt : it is however by no 

 means common. 



Draparnaldia sparsa. Filaments highly mucous, very slender, 

 sparingly branched ; branches acuminate, not usually ci- 

 liated ; cells rather broader than long. 

 This is by no means an uncommon species during the spring 

 and early part of the summer, being attached frequently to 

 dead leaves and sticks. In the fineness of the filaments, in the 

 shortness of the cells, as well as in the excessive mucosity of 

 its filaments, it seems to evince some relation to the genus 

 Chcetopjhora (a bad name, as the species of the genera Batra- 

 chiospermum and Draparnaldia are likewise chietophorous). 



