125 
F. CARNOSA. Encrusting; fleshy, with imbedded remote 
cells ; apertures contracted and armed. 
Flustra hispida, Fleming’s Brit. An., p. 537. Flustra 
Ca rnosa, Johnston’s Brit. Zoopli., p. 288, pi. 37, fig. 5. 
Bab. On Fuci, common. 
It is a thick, fleshy encrusting species, of a light brown or 
'team colour. The cells are imbedded, distant from each 
°Uier, with contracted wrinkled apertures of a half-moon- 
s hape, and three or four erect spinous teeth. 
F. TUBERCULATA. Encrusting, calcareous, thin ; cells 
oval, with a tubercle on the distal, and one on each lateral 
luargin. 
Flustra tuberculata, Johnston’s Brit. Zooph., p. 289, pi. 
K fig. 9. 
Bab. On stones a few miles from the shore. Polperro. 
Qoran. Mount’s bay. 
This is not a rare species, but is to be found encrusting 
s h>nes at short distances from the shore, from the entrance 
®f Plymouth sound to Falmouth harbour and Mounts bay. 
*0 a living state it is so much unlike the figures and des- 
Options given of it, that at one time I considered it a new 
8 Pecies, and it was by an examination of the dried specimens 
?“ly that the mistake was discovered. In a living state, 
I,s encrusting character resembles the Flustra membranacea, 
being thin and gauze-like; but it encrusts stones instead of 
s ea weed. It is most commonly found in circumscribed 
Etches varying from a quarter to one inch in diameter. 
The cells are alternate with stout calcareous rims, and 
Sf e oval, inclining to a quadrangular or lozenge-shape. At 
^ch augle is a largo stout tubercle, without any spine or 
P''ocess. B It is of a deep flesh red colour. As the cells 
ar e alternate, with a tubercle on the distal margin, each 
a Ppears to be surrounded with four, which slightly encroach 
the quadrangular diameter. These tubercles are always 
of a brighter colour than any other part. 
When the specimen is dried, this appearance is consider- 
a,)| y altered ; the quadrangular shape of the cells is changed 
' Q ’o an oval ; the tubercle on the distal margin appears 
, b e considerably above the cell and to stand on a hollow 
' ''Ole ; and on each side is a curved process. Ibis species 
®sutnes a great variety of forms, from the appearance of 
* s tubercle. In old specimens it is so much injured, and 
r, ietim es so entirely destroyed, that it is difficult to re- 
c °bUize it ; in these slates Dr. Johnstons figures represent it» 
Q 
