882. Thwaitesii {Thwaites's SpHarozyga) \ "spores elliptical, 

 once and a half as long as broad, commencing to be formed 

 from tin* cells mosi distant from the ciliated (connecting) 

 one," Harv. Ph.pl.ll^B. (Atlas, PL LXXX. Fig. J 

 lhih. ( )i: i!i t > muddi >sides of ditches of brackish water. 



My first acquaintance with this little planl was from a 

 beautifully mounted specimen, communicated by Bir. 

 Thwaites, who observes thai the connecting cell, which in 

 this species is ciliated, is generally placed at <»r near the 

 end of the filament, a peculiarity also noticed in Anabaina 

 velutina, Breb., and in seme others of this genus. 



3S3. Broomei {Broome's Spheerozyga) ; "spores numerous, el- 

 liptical, twice as long as wide, not much exceeding in width 

 the ordinary cells, commencing to be formed from the cells 

 nearest the connecting cells; connecting cells smooth, sub- 

 quadrate, rather Longer than wide," Thw., Harv. Phyc. Brit, 

 pi. 173, A. (Atlas, PL LXXX. Fig. 382. 1 



Jlnh. On dead leaves of Myriophyllwn, etc., in a brackish ditch 

 at Shirehampton, near Bristol. 

 A very distinct species, detected by G. E. Broome, Esq. 



384. Berkeleyana (Berkeley's Sphcerozyga) j ".-pore- large, 

 twice the width of the ordinary cells, oblong, half as 

 again as wide, becoming brown when mature, generally two 

 on each ride the connecting cell, which is spheroidal, slightly 

 compressed. Young filaments included, one or several 

 together, in a defined, mucous sheath, Thw., Hare. Phyc. 

 Brit.pl. 173, B. (Atlas, PL I.W \. 

 Jhih. Scattered amongsl the filaments of Conferva fracta, etc., 

 in a brackish ditch at Shirehampton, near Bristol. 

 "This fine species is interesting from the circumstance 

 of its filaments, when young, being enclosed, often several 

 together, in definite, gelatinous Bheaths, out o\' which they 

 appear to < scape before the Bpores are mature. There are 

 other Bpecies, occurring in fresh-water, which exhibit the 

 same peculiarity of si ructure." — Thw. 

 885. Ralfsii (Ralfs's Sphcerozyga), Harv. Man. ed. '1. p. 233. 



J lab. ? 



This plant is m>t figured in ' Phycologia.' 



( IV SPEEMOSIB L 



386. litorea (7V/c.v/m//v Spermosird)\ " filaments slightly m 



live, simple, cylindrical, enclosed in a ?erj delicate, mem- 



