184 BYN0PSI8 OF BBITI8H BEAWXBD8, 



their bushy branching, tin 1 most delicate ofthe Cladop 



having. t<> the naked eye. an aspect do! \ery unlike that of 

 ( . Rudolphiana, and being more Blender than C. gracilis. 



Under the microscope it is known by the wry large size of 



its nearly empty cells, in the centre of which ;i small sphe- 

 rical grain of emerald-green endoehrome is found. The 

 ramuli are so slender that they consist of a single row of 



such cells, and thus have something the character ofthe 

 threads of a Conferva. 



338. percursa ( The spreading Enteromorpha) ; frond capil- 

 lary, entangled and variously twisted, simple or having a lew 

 short spine-like ramuli, compressed, Bolid (?), reticulated; 

 cells quadrate, two or more (generally two) in the breadth 

 of the frond, the endoehrome nearly filling the cell, Hook. 

 Br. Fl. v. 2. p. 315. (Ati as, PI. LXII. Fig. 340.) 



Solenia percursa, Ag. Scytosiphon compressus, var., Lgngb. 

 Hob. Muddy sea-shores, at half-tide level. Annual. Spring and 

 summer. 

 The character by which E. JRalfsii differs from this 

 species is, the large size of the cells and the minuteness of 

 the grain of endoehrome in each. 



339. Ralfsii (Half s' 's Enteromorpha) ; frond capillary, simple, 

 or having a few short, spine-like ramuli, nearly solid, laxly 

 reticulated ; the cells large, hyaline (two to four in the 

 breadth of the frond), each cell containing a brilliant-green 

 grain of endoehrome, Harv. Phy. Brit. pi. 282. (Atlas, 

 PL LXIL Fig. 341.) 



Hob. On the oozy sea-shore, above half-tide level, spreading 

 widely. Annual. Summer. 

 I had prepared the plate here given for the purpose of 

 illustrating JE. percursa, in the full belief that the speci- 

 mens from which I made my figure were authentic exam- 

 ples of that species, having received them from Mr. Ealts 

 under that name : — but, happening to show the figure to 

 my friend Mr. Thwaites, that acute botanist assured me 

 that E. percursa was something very different. I admit 

 that the diagnosis of E. percursa given by Carmichael 

 will not apply to my plant. Of the original E. percursa 

 I have, then, as yet seen no specimens, and the plate hav- 

 ing been engraved and printed, I cannot hold it back for a 

 more minute examination and consultation. I am therefore 

 compelled to publish Mr. Ealfs's plant as a novel \\ 

 (if it be new) have great pleasure in bestowing his name. 



