TUNICATA. 
363 
B. violaceus, Edw. 
On Fuci, Belfast Bay, W. T. 
B. smaragdus, Edw. 
A species taken at Hollywood, Belfast Bay, by Dr. J. L. Drummond, 
in the summer of 1846, of which he made a drawing and noted the colour, 
seems to be the B. smaragdus. The notes are not in sufficient detail to in- 
sure certainty. 
Genus Botrylloides. 
B. albicans, Edw. 
July 1 Qth, 1846.— I found this species attached to the under side of a 
stone in a pool between tide-marks at Springvale, County of Down. It 
was likewise attached to Fuci (F. vesiculosus, &c.) growing in the rock- 
pools, and was in much smaller masses than the following species ; ge- 
nerally, but one system of individuals existed in each mass. On the small 
branches of Fuci to which it was attached there was not room for more ; 
nor was there indeed on the broadest portion of the main stem, whence 
the leading branches of the plant issued : — the latter is its favourite 
position. The specimens agreed in all respects with the descriptions and 
figures in Edwards’ work. 
B. rotifer a, Edw., 
Was attached to the under side of the same stone with the last, and 
covered several square inches of its surface. I mark it with doubt on ac- 
count merely of some little difference in colour. The “ consistance gela- 
tineuse” was rather hyaline than “jaunatre the individual forms were 
more of a uniform red than in Edwards’ figure, and were each as brightly 
coloured as in B. ruhrum, Edw., and of the hue that it is represented to be. 
The individuals being arranged in a scattered manner, and not thrown 
into masses as in B. rubrum, was a striking character. 
B. rubrum, M.-Edw. Mem. Ascid. Comp., p. 88, pi. 6, f. 3 ; Forb. and 
Hanl. Brit. Moll., vol. i. p. 24. 
From the middle of February last, and during spring, this handsome 
species was commonly thrown ashore at Cultra, Belfast Bay, its bright 
colour often rendering it quite a conspicuous object among the ordinary 
rejectamenta of the waves. Its attachment to plants which grow within 
a few fathoms of depth denoted its being an inhabitant of comparatively 
shallow water. The largest mass which came under my notice (brought 
to me by Mr. Wm. H. Patterson) was 4f inches in length, 1 l inch in 
breadth, and ^ inch in thickness at the thickest portion ; weight f of an 
ounce. It was adherent to several of the narrow leaves of Zostera marina, 
which are about | of an inch in breadth, and to these only. The gela- 
tinous mass was reddish-brown ; the systems of animals of a brilliant 
orange-red. It agreed in all respects with the description and figure of 
M.-Edwards. The variety in the ramification of the systems of animals 
through so large a mass was extremely beautiful, resembling an elegant 
pattern done in lace-work. 
A plant of Halidrys siliquosa dredged from five fathoms in Belfast Bay 
on the 3rd of April (kindly sent to me by Edmund Getty, Esq.) contain- 
ed several masses of Botrylloides. They were all of a very pale greyish 
gelatinous colour ; the systems of animals in some, more irregularly dis- 
