4 
there were 3 on one side, and 2 only on the other. In 
some rare instances, I noticed but 4 leaf-stems, 2 on either 
side. ‘The summit of the vesicle always presented an open 
space: the leaves are lanceolate, sharply attenuated at both 
extremities, their substance like the frond of F. Phyllitis, 
about 1j to 2 feet long, and measuring 2 inches in their 
greatest breadth ; some longitudinal nerves appear, of uncer- 
tain number, running from the base of the leaf to the middle, 
where they are lost in the substance. Such is the configura- 
tion of this Fucus in a young state; when older it alters so 
as to be scarcely recognisable, and then only acquires that 
remarkable appendage, which I before alluded to, and which 
I shall now proceed to explain. In advanced age, the stipes 
becomes immensely long, without, however, increasing pro- 
portionably in thickness; for whilst it remains at the base 
of the stoutness of packthread, its diameter, at 10 or 15 
fathoms distance, scarcely measures 2} lines. Gradually, 
the vesicle changes into a turnep-shaped, or retort-like 
cylinder, more than a fathom long, measuring, at its broad- 
est dimension that supports the leaf near the end, 4-6 
inches and even more, in diameter, while the lower end 
gradually and quite imperceptibly loses itself in the stipes. 
'The formation of the frond keeps an equally gradual ad- 
vance: the leaves described above are numerously divided 
in their length, the nerves of the young leaves indicating 
their future points of separation. Entangled at their bases by 
matting together, these attain a very great length and an 
equal increase of breadth; the tuft now covering an immense 
surface with its crowded masses. In one specimen, by no 
means the largest, which I examined, I calculated that there 
were upwards of 50 leaves, each 27 feet long. The Russians 
call this Fucus, (to which I had previously given the spe- 
cific name of Lutkeanus, in honour of our worthy Com- 
mander, who daily shows himself more zealous in favouring 
our Natural History labours,) See Otter Kohl, or the Sea 
Otter’s Cabbage. "The valuable animal, Lutra marina, makes 
particular choice of this sea-weed, as its favourite refuge and 
residence; delighting to rock and sleep on the long cylin- 
