101 
, 'This species on our coast attains about three inches in 
,. e 'ght, but is more commonly found about one. It is of a 
J§bt brown colour, and though much and dichotomously 
r anched, is not spreading, growing much like a poplar tree; 
branches are slender and formed only of the cells, w'bich 
are united in pairs, with a joint between each pair. The 
Be Hs are opposite, united at their backs, smooth and obliquely 
r Uncated. The appearance of the cells thus united is aptly 
8ai <l by Ellis, “ to resemble a coat of mail or pair of stays; 
a, "l the entrances of the cells look like the places for the 
ar >ns to come out at.” The polypes have ten ciliated 
e utacula, and are very active. 
HIPPOTHOA. Lamouroax. 
Generic Character: Polypidoms confervoid, adherent and 
Cr eeping, calcareous, irregularly branched, the branches 
frequently anastomosing, formed of eliptical cells linked 
to each other at the extremities; aperture lateral, near 
'be distal end. Polypes ascidian. 
^ADED CORALLINE. H. Catenularia. Cells egg- 
s haped, smallest end towards the centre of growth ; aper- 
ture large, oval, and at the larger end. PI. xviii., fig. 5. 
at ^lippothoa catenularia, Fleming’s Brit. An., p. 534. John- 
°u’s Brit. Zooph., p. 264, pi. 31, figs. 9 and 10. 
■6ai. On the Pinna ingens and P. rotundala, very com- 
° n> Polperro; Deadman point. 
^ bis is to be found on almost every Pinna drawn from deep 
a ater off the Deadman point, and west to the Lizard. It is 
j^Oiall bead-like coral, running over the surface of the shell. 
lj , ls adherent throughout, and formed of egg-shaped cells 
tlj , ^ together at their extremities. The larger end, placed 
s 0 8ta|| y, is occupied by the aperture, which is oval, and 
If "’^'inies very large with a plain thickened rim. As it 
>.* ■ . 0Ter the surface of the shell it is much and variously 
f ro m,f ‘ed. The ramifications arise at nearly right angles 
t|° 01 'he margins of the cells opposite the lower margin of 
sy' 0r ifice, and frequently cover two or three inches of 
be a , Ce ’ Sometimes the cells are so thickly arranged as to 
8 (| ! ) a ced in juxtaposition over half an inch ol surface, in 
o c 1 , a ease it very closely resembles a Flustra; and on three 
vir , as *° ns was only by examining the free cells of the 
te t yU . n ‘fr r unce that the character of the polypidom was de~ 
Cei] n " Bei fr When thus jointed into a Ftuslra-like form, the 
li,, 8 a Ppear inflated, and the apertures immersed; some- 
tbe surface is smooth and the situation of the cells only 
it i 5 ke d by the rounded apertures. In its more usual form 
’'ariously ramified and resembles, as Dr. Johnston has 
