20 
cpIIs by short, peduncles. In the summer and nntnmn tbj’) 
are plentifully produced on all parts of the polypidom. ^ 
polype is granular, with fourteen stout tentacula; and wm 
in activity, protrudes itself about the length of the 
beyond the aperture. The life of this species can be bn 
short duration. When growing on fuci, it is destroyed . 
the waves tearing these fuci from the rocks; and when 
fixes itself on the rocks, it soon becomes infested with n)in n ^ 
sponges and converv® which grow over the apertures 
the cells and prevent the polypes from having access to ^ 
water; whereby they perish. It is also much infested ' r l . 
minute insects ( enlomastraca ) of the genus Cyclops, w 
is probably the cause of the light so frequently given 
when this species is gently struck while in the water. 
SERTULARIA PINNA TA. Cells opposite, tubular, 
upper part free and divergent, with an even patulo 
aperture; vesicles obconical, trituberculate on the top' 
Sertularia Pinnata, Johnston’s Brit. Zooph., p. 127, pi' 
fig. 5 and 6. Sertularia Fuscescens, Turton’s Lin., vol. ’ 
p. 077. Lamouroux’s Cor. Flex., p. 195. Dyna® e 
Pinnata, Fleming’s Brit. An., p. 545. 
Uab. “ Ooeanus ad Prom. Lacertae, Cornubise,” PaM'* j 
I have not met with a specimen, and it is therefore call 
Cornish on the authority of Pallas. 
BLACK CORALLINE. S. Nigra. Cells very neaW 
opposite, approximated, appressed, small ovato tubm 9 ’ 
apertures even and not everted; vesicles like an unr'r 
fig, with small contracted terminal apertures. 
Sertularia Nigra, Turton’s Lin., vol. 4, p. 670. 
ston’s Brit. Zooph., p. 128, fig. 15, p. 129, and fig. 13, p. J ' 
Mantell’s Wonders of Geology, vol. 2, p. 534. Dynau> c 
Nigra, Fleming’s Brit. An., p. 545. 
Hal. Lizard point, Pallas; off Polperro and Dead® 9 ” 
point; not uncommon. ^ 
This species varies from three to six inches and sonieti® f( , 
even to eight inches in height. The trunk and pinn* JL 
stout, rigid, and divided into joints at regular intervals. 1 ^ 
pinnae arise from the trunk alternately, and very close to e '^j |0 
other. The cells are arranged in a bi-serial manner, on ^ 
pinnae and trunk ; they are semialternate, crowded, 
adnate or pressed against the polypidom ; they are tub" 
with even patulous apertures; on the lower part of the tr' ^ 
they are generally absent, but are always to be fount 
the upper and newer portions. The vesicles, in s * )8 '| ) y 
resembling unripe figs, are attached to the polypidom 
