168 Mr. A. H. Hassall’s Catalogue of Irish Zoophytes. 
S. pumila. On Fucus serratus, which it thickly covers, near low 
water mark. 
Booterstown.—Dublin bay ; not rare. 
S. Tamarisca. An inhabitant of deep water, on shells; rather rare. 
Blackrock, Dublin bay. 
S. abietina. Frequently covered with small and elegant tufts of 
C. eburnea, which give to the polypidom a very beautiful appearance ; 
it is sometimes found a foot in height, and of a bright pink colour, 
which it retains on drying. All the Sertularie are occasionally 
found coloured in this way. 
Dublin bay ; very abundant. 
S. Filicula.—Dublin bay ; rare. 
S. operculata. Of this common species a very delicate variety is 
occasionally met with, attaining a much greater height than the ordi- 
nary kind, and having the shoots waved or zigzag. 
Dublin and Killiney bays, on shells and fuci. 
S. argentea. Independently of the differences to be observed in 
the form of the cells and vesicles, which are generally pretty con- 
stant, between this and the following species, there are many others 
pertaining to their general habit and appearances. The polypidoms 
of this species are frequently met with growing in closely aggrega- 
ted clusters, and are sometimes even branched, a condition in which 
I have never found the other ; it is also of a darker colour and more 
rigid texture, and never attains the same height. The polypiers also 
do not end in the beautiful spire so remarkable in S. cupressina, but 
terminate much more abruptly. The branches too are usually shorter, 
broader, and not arched as in the other species. 
Dublin bay ; abundant. 
S. cupressina. ‘This species sometimes attains an elevation of 
more than two feet. The polypidom is occasionally denuded of its 
branches for a short distance up the stem, but this is by no means a 
constant occurrence, as in some others. © 
Dublin bay; abundant. 
ANTENNULARIA. 
Antennularia antennina. ‘The stems of this coralline sometimes 
exceed a foot in height, and are frequently clustered together to the 
number of thirty or forty. The number of branchlets in each whorl 
varies from five to nine, and in the same specimen the number 
usually remains the same throughout. I have a specimen in my pos- 
session from Brighton arising by a single trunk, which afterwards 
breaks up into eight or ten branches, these again subdividing; it 
well deserves, from its appearance, the appellation of ramosa. There 
is also in it an absence of the small tubular cells placed between the 
larger ones met with in A. antennina. See Plate V. Froman exami- 
nation of this specimen I am inclined to think that it is what Lamarck 
has described under the name of Antennularia ramosa, and that it is 
really and specifically distinct from the other species. I am far, 
however, from considering every branched specimen of Antennularia 
as the true A. ramosa. 
Dublin bay ; common. 
