Oscillatoriea.'] oscillatoria. 355 



This resembles the preceding, only that it is finer in 

 every respect. It cannot be called common, for I know no 

 other habitat than that in which I found it, — in a current 

 of tepid water, flowing from a boiler at the Turf Dyke coal- 

 pit, Stevenston. When taken out of the water it is like 

 green jelly. When a small portion of it is placed on paper, 

 and the paper is submerged, it almost immediately begins 

 to put forth its bright green glossy filaments, which in the 

 course of a few hours extend in all directions an inch or an 

 inch and a half in length. It makes a very beautiful 

 specimen, especially if the central patch from which the 

 filaments spring, is removed, and the space becomes filled 

 with filaments from the first growth. If the patch is not 

 removed, it is, when dried, apt to crack and fall ofiP, leaving 

 an empty space. 



3. Oscillatoria mucosa, Borj/. 



Stratum gelatinous, dark, seruginous green, glossy; fila- 

 ments large ; striae subdistant. 



This, like the former, seems to be a new species, as Mr. 

 Hassall had never seen any specimens but those I sent him. 

 I found them floating in a pool at the same coal-pit, but the 

 water was not warm, and not very pure. They formed 

 little filmy clouds, which were almost imperceptible. 



