% 
38 
Sea thread coralline, Ellis’ Coral., p. 21, pi. xii., no. 
a A. Serf, dichotoma, Ellis anil Solander’s Zooph., P* 
Tnrton’s Lin., vol. 4. p. 082. Stewart’s Elem., vol. " 
p. 446. Campanularia dichotoma, Fleming’s Brit. 1 ” 
p. 548. Grant’s Comparative Anatomy, 10, fig. 5. Cy®* 0 ' 
of Anatomv and Physiology, p. 108, fig. 30. Tempi® 1 
in Mag. Nat. Hist., vol. 9,’ p. 469. Laomedea dichotoi® ' 
Lamouronx’s Cor. Flex., p. 207. Johnston’s Brit. Zoop •’ 
p. 150, pi. 22, figs. 1 and 2. 
Bab. On stones from deep water, common; in p°° 
about low water mark; in Whitsand bay, Looe, Polp® ,|t! 
near Fowey, and Goran; common. On sponges, rare. 
It grows to the height of from six to ten inches, but is_ro° r .® 
commonly about one. The appearance of this speci® s ^ 
eonfervoid. It is of a light transparent horn colour, ro° 
by minute tubular fibres ; erect and dichotoroously branch 1 ^ 
The colls are campanulate, biserial, on annulated footstalk 3 
little longer than the depth of the cell ; the apertures 9 
even and unarmed. The whole polvpidom is divided 10 
long internodes, and the branches at tbeir origin are ® 
nutated, and those parts of the stem and branches which 
snpport to the cells are enlarged into kneed protuberant . 
The vesicles are ovoid, or urn-shaped and axillary. ^ 
ova are numerous and composed of two parts, a central d 9 ^ 
nucleus and a light surrounding zone. Beside this there 9 
some curious phenomena connected with the genim u ‘ e "‘ 
which are not mentioned here, because the nature and e 11 ^ 
racier of them are exceedingly obscure: Sir .1. G. P a v f(j 
Las also noticed them, but not explained them: they ' j t 
therefore retained for further consideration. Ellis say*,^ 
“ seems most curiously contrived, from its structure, to e 1 ” . 
the violence of the waves, all its joints being furnished 
springs.” 
KNOTTED SEA THREAD. L. Geniculata. Sh 0 ^ 
stem zig-zag, rarely branched ; cells bell-sbaped, alter® 9 ^ 
■with an even rim, on ringed foot-stalks, standing °° 
thickened joint of the stem. PI. x, __ 
Corallina confervoides gelatinosa alba, gcniculis er* 8 ® 1 * 
culis pellucid is, Raii, Synop. Stirp. vol. 1, p. 34 no. 7 . K» ot jj, 
thread Coralline, Ellis’ Coral., p. 22, pi. 12, no. 19, fig- 
Sort, geniculata, Ellis and Solander’s Zooph., p. 49. * p;, 
ton’s Lin., vol. 4, p. 682. Stewart’s Elem., vol. 2, p- ' 
Campanularia geniculata, Fleming’s Brit. An., P- 
Laomedea geniculata, Lamouroux’s Cor. Flex., 208. 
pleton in Mag. Nat. Hist., vol. 9, p. 466. Johnston’S P 
Zooph., p. 151, p|. xxi., figs. 1 ami 2. 
