97 
P°'ypidom is divided into internodes of nearly equal lengths, 
a nd about three times as long as the transverse diameter; 
'bese, however, are hardly visible but in dried specimens. 
The cells are oval, numerous, crowded, sub-pedunculated, 
? n d not congregated into companies. They are somewhat 
lrr egular in size, but are generally about twice as long as 
ll '.e diameter of the branch. The polypes are very active 
' f ith eight ciliated tcntacula. 
There are several discrepancies between this account, and 
H'ose given by Ellis, Fleming, Thompson and Johnston, but 
! f we suppose their descriptions to have been taken trom in- 
jured specimens, this in a similar condition closely resembles 
^'etn, otherwise it must be considered a new species. 
CRISIADJ3. 
Polypidom calcareous, or sub-calcareous, branched, con- 
fe rvoid, jointed ; the cells linked together in one or more 
Se fies, distinct, tubular or elliptical, with a terminal or sub- 
ter miual aperture, never closed with an operculm. 
CIUSIA. Lamouroux. 
Generic Character: Polypidom confervoid, rooted by tu- 
bular fibres, dicbotoinously branched ; the cells long and 
tubular, linked together in one or two series, the apertures 
r °und, terminal, and produced. Polypes ascidian. 
* Cells linked in a single series. 
QOAT'S-HORN CORALLINE. Crisia Cornula. Cells 
long and tubulous, with a curved termination, having a 
long bristle at the joint above each cell. PL 17, fig. 4. 
„ Tloat’s-horn Coralline, Ellis’ Coral., p. 42, no. 10, pi. 21, 
’§• c C. Cellaria cornuta, Ellis and Solander s Zoopli., 
2 &. Sertularia cornuta, Stewart’s Elem., vol. 2, p. 449. 
iur ton’s Lin vol. 4, p. 686. Eucratea cornuta, Lamou- 
*°Ux’ s Coral. Flex', p. 149, no. 260. Fleming’s Brit. An., 
, 5 4l. Crisia cornuta, Johnston’s Brit. Zooph., p. 260, 
31, figs. 1 and 2. Templeton in Mag. Nat. Hist., vol. 9, 
P- 4G9. ° 
tlal). On fuci and corallines, rare ; on the sides of the 
° r wich crab mixed with Crisia eburnca, common. Pol* 
err °, Lake Rock, Mevagissey and Wbitsand bays. 
, is calcareous, confervoid, about half an inch in height, 
3 is formed of a single row of cells, bent near their aper- 
v res , and placed one above another ; it is slender, erect, 
. e >\V hvii.i . .1. u- Qnn i,pri. and rooted by calcareous. 
y > auu UliU/CU U11C aoofo — — ’ . ' 
tn^ brittle, alternately branched, and rooted by calcareous, 
e nlar creeping fibres. Above the beaked termination ot 
h . cli cell is a long bristle, which is generally broken off in 
ese fved specimens. The apertures of the cells are even 
