P. K1TT0N ON DIATOMACEAItUM DILLWYNII. 169 



dis ; dissepimentis solutis, articulis quadratis, obliquis, transversim 

 fasciatis, maculatis, alternatum, refractis (" E. Bot.," tab. 1,889). 



On Faci and Conferva* in the sea. Miss Biddulph". 



(C. teniceformis according to Harvey, "Manual of British 

 Algae," 1841, and Greville in " Hooker's English Flora," 1883. 

 =Diatoma marinum=Grammatopliora marina of recent authors, to 

 which species C. Biddulpluana must also be referred. Dillwyn's 

 specimen, which I have examined, leaves no doubt as to the identity 

 of the two species. F. K.) 



C. fasciata. — C. filis simplicibus tenuibus mucosis purpurea- 

 fuscns, articulis medio-fascia angusta transversum notatis longitu- 

 dem diametrium cequantibus. — PI. VI., f. 5. 



On decayed leaves and sticks, &c, in a ditch at Stoke Newington. 

 Joseph Woods. 



Mr. Woods discovered this species in slippery masses about 1^ 

 inch long, of a purple brown colour, and forming a thick coat over 

 decayed substances in a ditch at Stoke Newington. The length 

 and diameter of the joints is equal, and in the middle of each 

 there is the appearance of a dark narrow transverse band, which, 

 however, proceeds from the internal organization of the plant, and 

 therefore appears somewhat shorter than the diameter of the fila- 

 ment. 



(C. fasciata=Melosira varians, F. K.) 



C. lineata. — C. filis simplicibus, tenuibus fragilibus fuscis ; dis- 

 sepimentis contractis ; articulis linea una alterave tenuissima 

 striatis, diametro sub-triplo longioribus. — PI. VI., f. 4. 



Among the leaves of water plants in the river Lea at Waltham- 

 stow. 



In March, 1802, I found a single small specimen of this species 

 among a jelly-like substance of the Tremella kind, which almost 

 covers the water-plants in the Lea at Walthamstow. The fila- 

 ments are simple, and very brittle, and of a brown colour. I have 

 not since been able to find more than a few imperfect filaments of 

 this plant. The length of the joints in some filaments is about 

 thrice, and in others not more than twice, the diameter, and they 

 are generally marked with one or two transverse lines at certain 

 distances from each other. 



(Dillwyn's specimen is Melosira subjiexiks of the " Synopsis." — 

 F. K.) 



C. nummuloides. — C. filis simplicibus, tenuibus, fragilibus fusco 



