2a0 K. BROWN, FLORULA DISCOANA. 



are thus much less rigid than if they were more dwarfish and 

 stunted in their growth. Jakobshavn harbour, 5 fathoms, July, 

 plentiful ; and outside of the harbour, in 3 fathoms, not so common. 



33. Conferva Youngeana, Dillw. 



To this species we refer a few filaments apparently attached to a 

 slice from the stem of Laminaria longicruris^ being unable satis- 

 factorily to refer them to any other. Found floating in Davis' 

 Strait, off" Rifkol, mixed with Schizonema obtusum. June. 



Ulvace^. 



34. Enteromorpha compressa^ Grev. 



As plentiful and as polymorphous apparently as on our own 

 shores. All the forms, however, seem easily referable to the 

 present species. Jakobshavn, 3 fathoms, July ; Sakkak, August. 



35. Ulva latissima, L. 



Equally abundant with the last. Jakobshavn, 3 fathoms. 

 August, &c. 



36. Porphyra vulgaris, Ag. 

 Sakkak, 2 fathoms. August. 



37. Bangia fusco- purpurea, Lyngb. 



Floating in the sea, Davis' Strait. May. 



OSCILLATORIACE^. 



38. Lynghya Carmichaelii, Harv. 



Filaments of this species are frequently entangled among other 

 specimens, so that the species does not appear to be uncommon, 

 but they are very variable in thickness, and several species may 

 be included. Floating in the sea, parasitic on the stem of Lami- 

 naria longicruris, in Davis' Strait, ofi" Holsteensborg. May. 



39. L.flacca, Harv. 



Only a few filaments of this were observed mixed with the last 

 and others. 



40. L, speciosa, Carm. 



A fine specimen of this beautiful species was picked up floating 

 in Davis' Strait, north of Holsteensborg. May. 



(VI.) Freshwater AlgiB. By G. Dickie, M.A., M.D., F.L.S., 

 Professor of Botany in the University of Aberdeen. 



Ulvace^. 



1. Prasiolajluviatilis, Sommerfeldt. 



This was first described as a native of Norway by Sommerfeldt 

 in 1828. Meneghini has more recently published it as P. Sauteri, 

 and Grunow has constituted var. j3, jfiTaw^mawm; it is, however, 

 right to retain the name first given .it. Both forms are in this 



