608 
of Edinburgh^ Session 1865 - 66 . 
the collection of Lamiiiarise, chiefly from the Monich region, formed 
at the kelp factory. On a tuft of Tubularia indivisa from the deep 
water of the Minch, two specimens of Bete'pora Beaniana occurred. 
One of these adhered to the test of an Ascidian in a position which 
prevented the coralline from following its usual law of having the 
cells only on the concave side, since, to accommodate itself to cir- 
cumstances, the Eetepora had its cells on the convex side. The 
latter, however, may be regarded only as a contorted inner or con- 
cave side. A small independent Eetepora on the same mass pre- 
sented a peculiarity in having its inner or cellular surface hispid 
with rather stout, simple spines. The apertures of the cells were 
round, with a raised tooth on one edge, like the cells of R. Beaniana. 
The outer or smooth side in the various specimens is marked by 
delicate white lines, which at first sight look like cracks. 
List of Polyzoa. 
Tubulipora patina. l 
Lepralia verrucosa. 
hispida. 
variolosa. 
flabellaris. 
nitida. 
serpens. 
unicornis. 
hyalina. 
Ballii. 
Alecto granulata, va.\ 
ciliata. 
Crisia eburnea. 
spinifera. 
denticulata. 
immersa. 
geniculata. 
violacea. 
Crisidia cornuta. 
bispinusa. 
setacea. 
Membranipora pilosa. 
Hippothoa divaricata. 
meinbranacea. 
Cellepora pumicosa. 
Cellularia ciliata. 
ramulosa. 
scruposa. 
Lepralia hyalina. 
reptans. 
tenuis 
Flustra meinbranacea. 
Hassallii. 
Eetepora Beaniana. 
linearis. 
Salicornaria farciminoides. 
granifera. 
Alcyonidium gelatinosum. 
auriculata. 
hirsutum. 
punctata. 
parasiticum. 
annulata. 
Flustra hispida. 
biforis. 
Bowerbankia imbricata. 
Peachii. 
Pedicellina echinata. 
pediostoma. 
The island is peculiarly rich in Ascidians, thus afibrding a marked 
contrast to the eastern shores of Scotland, where the compound 
species, and a few solitary ones under stones, are the only repre- 
