109 
^ISCOPORA HISPIDA. Encrusting, with a circum- 
scribed base, calcareous, ridged or waved ; cells coalescent, 
erect; apertures patulous, armed with one larger and two 
smaller teeth. PI. xix., fig. t. 
Discopora hispida, Fleming’s Brit. An., p. 530. Johnstons 
«rit. Zooph., p. 270, pi. 30, figs. 9, 11- 
Hab. On shells, stones, and corallines, from deep water, 
c °tumon. Polperro, Fowey, Goran, &c. 
This very common species rarely exceeds an inch, but is 
ftost commonly found about otie-half or three-fourths of an 
*Qch in diameter. It is calcareous, white, and from the 
juxtaposition of the tubes, very solid. It is not a^ mere 
'Ucrustation, for it sometimes attains the thickness ot half 
inch, but is most commonly about the tenth ot an inch in 
uepth. The surface is most commonly uneven, either with 
8®ntly undulating ridges or papillary eminences; and as the 
’■ubes are so small that they cannot be distinctly seen with 
l he naked eye, it looks like a piece of white embossed 
j’ e lvet. The lubes are irregular in size, erect, or but slightly 
Waning, and the ridges or unevenness of the surface is 
deduced by their unequal growth. The apertures ot the 
*ubes are patulous, and sometimes even and unarmed, though 
^'ost commonly armed with two or three stout conoidal 
s Pines ; which is probably the manner in which the tubes 
8 r °w in length. 
CELLEPORIDiE. 
Polypidoms calcareous, or membrano-calcareous, lobed, 
pUlous or crustaceous, formed of an aggregation of cells 
' s posed usually in quincunx; cells utricular, in justa-position 
ll h contracted terminal apertures, often covered with an 
“Perculum, 
CELLEPORA. 
Ge »en‘c Character: Polypidoms calcareous, or membrano- 
Ca lcareous, cellular, lobed, ratnous, formed of urceolate 
Ce lls heaped together, or arranged in a quincunx. Polypes 
as cidian. 
^LLEPORA VITRINA. Encrusting, calcareous ; cells 
° v oid, very small, pearly, and irregularly arranged. 
P1 - xxii., fig. l. 
Q&ab, On stones in moderately deep water, not rare. 
° r an, j|/ r . Peach. Polperro. Mount’s bay. 
^ e l icate and beautiful species, is very small ; it is 
Rusting, circumscribed and rarely exceeding a quarter ot 
Vj. 1(lc h in diameter. Tlie cells arc small, transparent, 
re ous or pearly in their appearance and vex-y irregularly 
o 
