31 
l) 6l ' a l, closely arranged, bulging at the base, contracted at the 
4 c .*> w ith unarmed apertures pointed at the outer margin, 
c>ii are s * tn ated oa the branches and pinnae only. The 
. j S ? n ea ch inlernode of the pinnae are crowded together 
y *n contact; but where the internodes join, there is a 
ac ancy, so that they look as if congregated into parallel 
v °)panies, similar to what occurs in the genus Serialaria. A 
w '! r . let y frequently occurs in the distribution of the cells 
'ich present the appearance of being arranged in a double 
This is produced by the cells, instead of being arranged 
a close straight row, being made to lie alternately on 
^her side of a median line, much in the same way as if 
j.® teeth of a saw were bent alternately in opposite 
c rect i°ns. The vesicles are pear-shaped, furrowed, with 
a n tracted tubular apertures, pedunculated, and irregularly 
^ibuted. 
(.ph'his has given a very good figure of this species, in the 
■j,j Q tre of the curious frontispiece to his Essay on Corallines, 
pi figure at pi. 7 is not so good either as that, or the one at 
t , fig- 6> which he sufficiently explains, by saying it was 
j eo f rom a d r i ec i specimen. Dr. Grant, as quoted by 
Boston, represents the terminations of the stems in this 
P e <fies, as being open during growth ; a remark which my 
PPortunitieg do not enable me to confirm. 
^pDED CORALLINE. P. Cristata. Stem simple, 
Pmnious; pinna; alternate; cells unilateral, in a close row 
the upper side of the pinnae ; apertures large ; margins 
® e ply dentated, with a prominent spine, inferior to the 
11,1 ! vesicles barrel-shaped, with serrated ribs. PI, viii. 
Podded Coralline, Ellis’ Coral., p. 13, no. 12, pi. 7 
43, 
l D w. — — y r * -y - — ' r~ 
0 B. Sertularia pluma, Ellis and Solander’s Zooph., 
P. 4 J Ur ‘? n ’ S Lin . 
Aglaophema 
vol. 4, p. 679, Stewart’s Elem., vo 
p_ , -Agiaopnenia pluma, Lamouroux’s Coral., Flex. 
p| J /°- Plumtilaria pluma, Fleming’s Brit. An., p. 546 
P- 4 ('~ lata cristata, Templeton in Mag. Nat. Hist., vol. 9 
Pl.‘>o Johnston's Brit. Zooph., p. 143, pi. 19, figs, and 3. 
' 5 fig- 1. 
f f 0to Aschlia, Fuci, Pinna ingens, oysters, stones, 
°2 e fifty fathoms ol 
e > Seaton, Goran, Port 
Tlr 
St at| i,s common and delicate species is attached to the sub- 
on which it grows by means of brown, creeping, 
Se od Sr .fibres, which trail irregularly in all directions, and 
higjj ?o plumous shoots from one to three and halt inches 
ed^’.'rregularly throughout its course. The stem is polish* 
'oted, of a dark brown, and frequently almost of a black 
of water, very common. Polperro, 
Loe, &c. 
