30 
one on each internode, and between them are two minn ie 
hollow denticles, which are visible only under a microscope* 
One of these minute denticles appears to be placed on a ° 
inter-articular portion placed between the extremities of 
internodcs. The cells are small, cup-shaped, with patulo" 
unarmed apertures which are directed upwards. >■ 11 
vesicles are situated in the axillae of the brancblets, 0 
where they arise from the stem, they are pcar-sbap 00 ’ 
rather small, smooth with contracted subterminal aperture-^ 
In specimens washed on shore, the brancblets are common J 
broken off or much injured, those taken in trawl nets h< lV 
them about the sixth of an inch in length, while those f r °' 
deep water which have been brought up by the hook, v ® ' 
frequently have them three quarters of an inch in length- 
PLUMULARIA. Lauiark. 
Generic Character: Plant-like, rooted, simple or branch®' 
the shoots or offsets plumous; cells uniserial, small, scssi > 
unilateral, usually seated in the axilla of a horny spi t,c 
vosicles scattered", unilateral. Polypes hydraform. 
• # 
The general appearance of this genus is the same as 
of Scrtularia ; but it is distinguished from it by having 00 
one row of cells on the pinnae. 
* Stem a single tube. r 
SICKLE CORALLINE. P. Falcata. Stem wa^j’ 
branched, alternately pinnated; cells crowded in a siOr 
row, with plain apertures, tubular, slightly bulging at 11 
base- _ . fi ,|. 
Corallina mnscosa pennata, ramulis et capillamentis > ^ 
catis, Raii, Synop. Slirp,, vol. 1, p. 36, no. 16. Sickle Co'® 
line, Ellis’ Cor., p. 12, pi. 7, fig. a A, pi. 38, lig. 6. 
falcata, Ellis and Solander’s Zooph., p. 42. Turton’s L' 
vol. 4, p. 679. Blumenbach’s Man., p. 273. Ste«' ar , 
A°" 
Eleni., vol. 2, p. 443. Plum, falcata, Fleming’s Brit, 
p. 646. Templeton in Mag. Nat. Hist., vol. 9, p. 466. 
ston’s Brit. Zoopb., p. 141, pi. xviii., figs. 1, 2. 
Hab. On shells from deep water, from the Eddyston® 
the Lizard ; common. 
This species rises to the height of from four to eight 
The stem is waved, slender, of equal thickness throng 0 ^ 
brown, smooth and divided at irregular intervals by in»p er s ( 
<inntn r I * La knnnalt no nmlaa a a m a m hot i snmrnl 4\ v-1 II I \ 11 1 ^ ^ 
In t "’ i5 
septa. The branches arise somewhat irregularly, but - , e 
ie 
In 
manner it may be said that the branches arise in all® r ^ 
C 
commonly from the convex side of the waved line 01 
stem or trunk; and in companies of three or four. ^ n niJ tt> 
threes. They are pinnated ; the pinnae are alternate , 
irregularly divided by imperfect septa. The cells are ° ! ‘ 
