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. 



5. Tamarisca. An inhabitant of deep water, on shells ; rather rare. 

 Blackrock, Dublin bay. 



6. 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 Sertularice 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. From an 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. 



