THE NOETH ATLANTIC 0CEA:N^. 457 



The substance thus picked up by Captain Mitchell was in ex- 

 cellent condition, and, besides three Algae, contained : — numerous 

 fragments, more or less decayed, of wood both exogenous and en- 

 dogenous ; seedling plants several inches long, all with a pair of 

 cotyledons, roots, and terminal bud, quite fresh ; small fruits par- 

 tially decayed, evidently 1-seeded legumes; intermixed were vari- 

 ous microscopical Crustacea, and a common oceanic insect, one 

 of the Hydrodromidse, genus Halolates ; on some of the pieces of 

 drift wood were numerous elliptical ova of a deep orange-colour, 

 mixed with which was growing the smallest of the three Algae 

 now to be described. 



The largest and most abundant of the Algae might be compared 

 to pale green fleece ; it evidently belongs to the family Ulvaceae, 

 different from any one known to me or described in any work 

 to which I have access. It is a near ally to the plant described 

 and figured in the * Phycologia Britannica ' under the name 

 EnteromorjpTia Ralfsii, authentic specimens of which I possess. 



The tubular frond is the main character of the genus Entero- 

 morpJia^ hence the name ; neverthess there are in the British list 

 two usually included in that genus, although they are not tubular, 

 viz. E. percursa and E. Balfsii, the former having a flat frond, 

 the latter being cylindrical. 



Areschoug, in his * Phyceae Scandinavicse Marinse,* 1850, placed 

 E, percursa in a new genus, Tetranemaj characterized by a qua- 

 drangular frond, composed of four series of cells — a character, 

 however, chiefly in the young plant, there being more than four 

 in maturer age ; this same plant has been placed by Kutzing 

 m Schizogonium. 



For the reason stated above, I consider that E. Ealfsii ought 

 to be separated from Enterof)xorp1ia^ and placed along with the 

 new species in a genus which I propose to call Kallonema, 



Genus KliLLOifEMA. 



Character. — Fronds filamentous, simple or branched, solid and 

 round, of four series of cells. 



!• K. Ralfsii, Harv. "Frond capillar}, simple, or having few short 

 spine-like ramuli " {Phycologia Britannica, ph 282). 



Lac. Sea-shore, Bangor, North Wales, Mr, Ralfs, Found also at Cher- 

 bourg by M. Le Jolis. 



2, K. PKLLUCJDUM, n. sp. Frond simple, subclavate upwards, root- 

 ing below. 



