22 
have been procured. It varies in height from four to tweW® 
inches, but the Cornish specimens did not exceed six. It 1 
rather’ delicate, and of a semi-transparent born colour in- 
clining to pink when living, changing to a deeper and do ® 
colour in dying. The branches, which are widely separate 
from each other, are given off alternately. The cells , a 
opposite, pellucid, attached to the polypidom by the bnsw 
the upper half being free and divergent, and distributed in < 
biserial manner; their apertures are patulous, with two ater 
tooth-like inequalities. The vesicles are unilateral and ari» 
from the base of the upper row of cells; they are shortly P 
dunculated, stout, longitutinally furrowed, and their apertur^ 
are small and tubular. They vary in shape according to a» ^ 
When young they are urn shaped with tubular apertures- 
little older, the rim at the base of the neck becomes enlarg^ 
and sharp-edged, with two small horns; when old, the oe 
and month disappear after the ova have escaped, and 
margin becomes irregularly festooned. 
SEA FIR. S. Abietina. Cells very nearly oppos'^’ 
tubular, slightly bellied at the h’se; mouth simple » 
unarmed ; the upper half free: vesicles ovoid with a n« 
Cornllina marina Abietis forma. Muscus niarinus UJSJ® 
argute denlicnlatis Raii Synop. Slirp., vol. 1, p. 35, no. ' 
Sea Fir, Ellis’ Cor., p. 4, pi. 1, fig. b, B., no. 2. W j, 
iae.ua Abietina, Fleming’s Brit. An., p. 543. Sertui* 
Abietina, Ellis and Solander’s Zooph,, p. 36, no. 2. 
nionroux’s Cor. Flex., p. 186 and 187. Turton’s Lin., vo • ^ 
p. 676. Blumenbach’s Man., p. 273. Stewart’s Elem voi-^ 
p" 44 i. Templeton in Mag. Nat. Hist., vol. 9, p. 468. 
ston’s Bril. Zooph., p. 130, pi. x., fig. 1, 1. gJJ( 
Hah. On stones, shells and Gorgonia verrucosa, comi^ 
from deep water. In the Fowey river, on stones and s» 
This species varies in height from four to eight inC J ) 1 iu e 
growing in great luxuriance on Pinna, at from six to 
leagues’ south of the Dead man point; and less so near ^ 
shores, where it is generally in an injured state, havGL-j. 
branches and cells knocked off by the violence of the « t , 
In a perfect state the polypidom is of a light brown c ° cg ||j 
polished, compressed laterally, slightly bent, and h* s 
both on the branches and trunk. The branches win® ^ 
about as large as the trunk, arise in ao alternate manner. ^ 
more closclv together than iu the last species. The ce' y 
semi-alternale, bellied at the base, with contracte y 
everted apertures, and are attached only at the a ^lii c ^ 
upper portion being free and diverging. The vesicles, ^ 
are few in number, small, and irregularly distributees 
