ON THE FAUNA OF IRELAND, 271 
habiting only the extreme southern coast of England. One species—Xantho 
vivulosus—has a place in the Irish and not in the British catalogue, but Pro- 
fessor Bell informs me that he has seen English specimens. 
Of the Anomoura there are five British species, all of which are likewise 
Trish, and to the latter are to be added four or five species of Pagurus above 
indicated: what the P. erinaceus of Mr. J. V. Thompson is I do not know, 
but the four species named by myself are very distinct from each other, and 
unknown as British: whether they be all undescribed is yet to be determined. 
They were taken by Mr. Hyndman and myself when dredging in deep water 
in the loughs of Strangford and Belfast. 
Of the twenty-six British Macroura * all but seven are recorded as Irish. 
Five of these—Avia stirhynchus, Gebia stellata, G'. deltura, Hippolyte Pri- 
deauxiana, and H. Moorti—were known to Leach as from the south of 
Devonshire only : Hippolyte Sowerbei was obtained at Newhaven, near Edin- 
burgh; Peneus trisulcatus on the coast of Wales. Two species—Pasiphea 
sivado and Palemon Leachii—have a place in the Irish and not in the British 
list. : 
The Decapodous Crustacea alone, I have critically studied throughout ; 
consequently, so far only can a particular comparison of the species of the 
two islands be instituted: indeed of the British species belonging to the fol- 
lowing orders, from Stomapoda to Pychnogonida inclusive, no proper eata- 
logue is extant, and were those now known brought together and compared 
with the Irish species, the result would, as in the instance of the Annelida, 
simply denote how many belonging to each island had been determined, with- 
out giving any idea, as in the better studied portions of the Invertebrata, of 
the number positively, of each locality, or relatively, of the one island to the 
other. The undetermined Irish species in my own collection are perhaps 
thirty in number. 
ANNELIDA., 
About one-half of the Ammnelides in this catalogue were known to Tem- 
pleton (Mag. Nat. Hist. ix.); the remainder, with the exception of a very 
few indicated by myself (Annals Nat. Hist. v. 247, vii.482, and xiii.), have been 
investigated by my friend Dr. Johnston of Berwick-upon-Tweed, who kindly 
undertook to describe the species collected on the Irish shores (Annals Nat. 
Hist, v. p. 168 and 305, and vol. xiii.). He has likewise favoured me with a 
very elaborate manuscript catalogue of all the British Annelides on record 
with their numerous synonyma, and which it is but proper to mention, was 
drawn up with especial reference to a comparison of the British and Irish 
species in this Report. But, it is to be hoped that this catalogue will serve 
as the foundation of a work on the subject by Dr. Johnston. 
Distribution. 
ANNELIDA. 
Order 1. Apopa. Slele/4 
. . = a 
Tribe Nemertina. allel tal ka 
Pare EANICUS L072 setcsdavtdeiauho+cescvanes gugeanecaaoaaces Can aheiahanmgadtae 
emai ialng, aargp.; MSS. (1) ees is etc aa suas cua cas vamasedege ea} ssaeence) x 
Lineus longissimus, Sow. ; Nemertes Borlasii, Cuv............ avasbavecit ants ele x 
* In this number the species published by Mr. Harry Goodsir in the Edinburgh 
Philosophical Journal, vol. xxxiv., are not ineluded, as he does not feel certain that 
they should be brought under Macroura. 
+ That little trouble has yet been taken to ascertain the distribution of the Irish 
Annelides is indicated in connection with the first species named, which doubtless is 
not confined to the north, 
