ON THE FAUNA OF IRELAND. 265 
» So little attention has been bestowed on the Mollusca Tunicata of Great 
Britain and Ireland, that it is perhaps unnecessary to draw the usual com- 
parison. More Irish than British species can however be announced. Of the 
thirteen British simple Ascidians recorded, seven are Irish, in addition to which 
are eleven unrecorded as indigenous to the coasts of the largey island. Of 
the ten “ compound” species published as British five are Irish, to which latter 
nine, unnoticed as indigenous to the seas of Great Britain, are to be added: 
all the species of the preceding catalogue marked (I.) are probably to be 
found on the British coast. So little of the history or geographical distribu- 
tion of the Moll. Tunicata is known that the mere record of the species ob- 
tained in any locality possesses interest. The greater number of those here 
noticed are identical with the species found by Muller on the coast of Den- 
mark ; several, both of the “simple” and “ compound,” are the same as those 
of France described by Savigny and Milne Edwards, and a few of each divi- 
sion to those procured by Delle Chiaje on the coast of Naples. 
Nearly all the species enumerated here were taken by dredging, as were a 
number of others (simple and compound) which are still undetermined. 
Professor Edward Forbes and Mr. John Goodsir, in the course of their 
dredging, have collected many species from various parts of the British coast, 
a very few of which are yet published. 
To take a general view of the Mollusca of Ireland, as exhibited in the pre- 
ceding catalogue, it would seem, regarding the subject positively, that a re- 
spectable knowledge of all the classes and orders has been acquired, and re- 
garding it comparatively, that on the whole the species have been perhaps as 
well ascertained as those of Great Britain. The relative difference in the 
number of species (except perhaps in Nudibranchia) will probably hold good 
after the closest investigation of the subject in both islands: in the Bivalves 
only among the Testacea is the difference very striking. Considering the 
geographical position of the two islands, the smaller one being the farther 
removed from the great continental coast, the shores of Ireland being only 
about one-third the extent of those of the larger island, and what is of more 
consequence, limited to one-third of the degrees of latitude over which Great 
Britain with its neighbouring islands (whose fauna it includes) extend, the 
relative number of species known as Irish is as great as would @ priori be 
anticipated. 
CIRRHIPEDA. 
The species of Irish Cirrhipeda known to Brown and Turton were included 
in their catalogues of “'Testacea.” Capt. Portlock, in bringing before the 
Royal Irish Academy (Jan. 23, 1837) a notice of Anatifa vitrea, read a list 
of the native Pedunculated Cirrhipeda, communicated to him by Mr. R.Ball* ; 
and additional species have been contributed by myself to the Annals of Nat. 
Hist. vol. xiii. 
Distribution, 
CIRRHIPEDA. 
ee Zs 
~ aQ ~~ 
: Sjals| 2 
Cirr. Pedunculata. A\A IE Ia 
Anatifa levis, Lam.; Lepas anatifera, Lin. ....cccscccsseceseceneesaessnescenes Pepe 
momeecntata, am, svar. A. levis, WoL. acadececesdeceaecesvoscackecsont > 
», striata, Lam.; Lep. anserifera, Lim.  .cccsccscecscecsecscvcsscvcoseses blaleke 
* Proceedings of the Royal Irish Academy, vol. i. p- 30, 
