LLAT0B1 L( 197 



•gioides, ('. Youngana, and probably C. collabens, a species 

 of which bul little is yet known. These species might very 

 well be brought together under one generic head, as they 

 certainly have characters in common with each other, and 

 Buch of them as have, like the present, been classed with 

 the JjvngbycB differ from the type of thai genus in haying 

 a distinct ly articulated filament. 



;»7<>. Cutleriee (Miss Cutlet** Lyngbya) ; filaments excessively 

 slender, Boft, articulated : articulations about as long as 

 broad, the endochrome at length formed into a Bpherical 

 Bporidium, Harv.Phyc.Brit.pl.$&& (Atlas, PL LXXVUL 

 Fig. 370.) 

 lliih. [n estuaries. Annual. Spring and summer. 



This plant has all the generic characters of Kiitzing's 

 genus Hormotrichn m* out it does not appear to accord spe- 

 cifically with any of the species described by that author. 



CIV. MTCROCOLKl 8. 



371. anguiformis [The snake-like Microcolevs); sheaths snake- 

 like, simple, decumbent, tapering much to the extremity; 

 filaments slender, with distant >t ri.r. Harv.Phyc.Brit.p 

 (Atlas, PL I.WYIII. Fig. 371.) 

 llah. Coast of Wales. Pools of hrackish water, near the shore, 

 at Dolgelly. 

 A minute but curious Alga, allied in many points to Os- 

 cillatoria, from which genus Mia *ocoli ms chiefly differs in 

 possessing frond-like sheaths, containing threads bundled 

 together. At first these sheaths appear scarcely more com- 

 pound than a single filament ; but as the plant advances, the 

 sheath widens and is found full of a multitude of filaments. 

 i 'scillate. like thi tie o{ an Oscillatoria, either from the 

 wide mouth of the sheath, or from any accidental rupture 

 which may happen in its side. 



C\ . OSCILLATORIA. 



:\7-. littoralis (The shore Oscillatoria)) Btratum of a vividly 

 Beruginous-green colour; filaments thick, dark-green, va- 

 rioualj curved : Btrise conspicuous, close-set, i 

 vned. ' (Atlas, PL IAW'III. Fig. 372.) 



JI<ih. Appin. In pools, along the muddj sea-shore, flooded by 

 Boring t ides. 

 ( >f this I have only Been Captain Cannichael's specimens, 



from one of which the figure is taken. I find the filaments 



