174 Mr. A. H. Hassall’s Catalogue of Irish Zoophytes. 
GRANTIA*. 
Grantia compressa! G. foliacea of Montagu. 
Adhering to the under side of rocks above low-water mark ; Monks- 
town. 
G. Coronata.—Monkstown : same as the preceding. 
MILLEPORA. 
Millepora polymorpha, Linn. 
Millepora informis, Lamarck.—Dublin bay; not common. 
Millepora lichenoides. ‘‘'This Millepora has slender semicircular 
plates which constantly grow horizontally.’ Lamouroux makes this 
a Melobesia under the name Melobesia pustulosa. It ought, I think, 
to be considered a Madrephyllia, under which head Dr. Johnston has 
placed it. M. byssoides, Lamarck. 
CoRALLINA. 
Corallina officinalis. ‘There are several well-marked varieties of 
this Corallina cylindrica. 
‘‘Corallina rubens sive muscus marinus.’’—Park. 
‘« This coralline, when magnified, appears to grow in branches, al- 
ways dividing into two parts, consisting of long cylindrical joints 
connected by small tubuli.”—Ellis. 
C. rubens, var. spenophecos. 
The above four corallines are found attached to rocks at Bray 
Head, near Dublin. 
It is only by an extensive examination of catalogues similar 
to the foregoing, that we shail be able to arrive at any certain 
conclusions regarding the geographical distribution of zoo- 
phytes, and the changes in the growth and habits occasioned 
by the different localities in which they are met with. On 
reference to the preceding list, it will appear that many spe- 
cies common in the North of England and Scotland are aN of 
not to be found at all on this coast, or are so sparingly; and 
on the other hand, many that are rare on the English coast are 
abundant on the Irish. Thus, Thuiaria thyja, common in 
the North of England, has never, I believe, been noticed on 
any part of the coast of Ireland, and certainly not on that 
embraced in the present catalogue. 
Again, I have never met with F. truncata and F. carbasea, 
both very common on the coasts of Northumberland and Dur- 
ham, and also occasionally found upon some parts of the Irish 
coast. Many species of Plumularia, and two or three of Ser- 
tularia, are wanting in these bays ; and the genus Eschara ap- 
pears to be absent not only from this part but from the coast 
of Ireland generally ; while Thoa Beanii, Discopora hispida, 
* See Grant in 2nd vol. of Edin, New Phil. Journ. 
