Flustra. 
Z. ASCIDIOIDA. 
287 
F. aviculaire, Blainv. Actinolog. 451 F. angustiloba, Lam. Anim. 
s. Vert. ii. 158. 2de edit. ii. 222. — — F. capitata, Hogg's Stock. 36. 
Cri sia flustroides, Lamour. Corall. Flex. 141. Corail. 61. 
Hah. Attached to other corallines and old shells in deep water. 
Torbay, Dr Coldstream. Cullercoats, Northumberland, Mr Alder. 
Berwick Bay, G J. Cork harbour, J. V. Thompson. 
Usually about an inch in height, csespitose and fan-like, or spread 
out circularly, of a cinereous colour, membrano-calcareous, brittle 
when dry, deeply divided in a dichotomous manner into narrow thin 
plane segments, truncate at the end, formed of four or five series of 
oblong cells, capped with a hollow globose pearly operculum seated 
between the spines, of which there is one on each side of the circu- 
lar aperture. The opercula are so numerous that they give to the 
upper surface the appearance of being thickly strewn with orient 
pearls : the under surface is even and longitudinally striated, the 
number of striae corresponding to the number of rows in which the 
cells are disposed. 
7. F. Murray ana, cells multiserial , ovate , the margin armed 
with Q or 8 spines shorter than the diameter of the cell. Mr Bean. 
Plate xxxvi. Fig 5, 6. 
Flustra Murrayana, Bean , MSS. named “ after Dr Murray, a scientific and 
zealous naturalist of Scarborough. ” 
Hah. In deep water. Scarborough, very rare, Mr Dean. 
This pretty species grows in entangled spreading masses which are 
rooted to the object of attachment by numerous long thread-like tu- 
bular fibres, wrinkled when dry, and apparently always pullulating 
from the side or inferior surface of a marginal cell. Polypidom 
scarcely an inch in height, of a light colour and thin membranous 
texture, dichotomous, spreading, the segments plane, narrow wedge- 
shaped, truncate, the upper surface roughish with the cells, which are 
disposed in the usual quincuncial manner, but are more elevated than 
in any other species ; the under surface glistening, striate : cells uni- 
lateral, so large that their figure is perceptible to the naked eye, ovate, 
truncate above with a short hollow spinuie at each angle, and there 
are from 4 to 6 rather longer spinules protecting the margin of the 
elliptical aperture — I have seen only Mr Bean’s fine specimen, which 
is accurately delineated in our figure. The species is very distinct 
from any hitherto described. 
* * * Crustaceous. 
8 . F. membranacea, cells ohlong , with a short blunt spine at 
each corner. J. Ellis. 
Plate xxxvii. Fig. 1, 2, 3. 
