ON THE FAUNA OF IRELAND. 357 
mon Shrew-mouse of Ireland (Sorex rusticus), indeed, I have 
not seen any specimens from Scotland, but there can be little 
doubt that the animal is found there. 
Note 2.—The situation of the Isle of Man—midway between 
Great Britain and Ireland—suggests the inquiry whether cer- 
tain species not found in the latter island prevail there. On 
this subject Mr. E. Forbes informs me that the Mole, Squirrel, 
Dormouse, and Roe-deer are not indigenous to the Isle of 
Man; neither is the Toad, nor any species of Ophidian Rep- 
tile. A skin of the Hare of the island sent me by Mr. Forbes 
is that of Z. timidus, the species found in Great Britain, and 
represented by L. Azbernicus in Ireland*. 
* It may be desirable, with reference to the above remarks, to allude briefly 
to such species as, found in Great Britain and not in Ireland, prevail further to 
the west. In Mammalia, five of the British and non-Irish species are found in 
the western hemisphere. ‘They all belong to the division Mamm. Aquatica, 
and are only occasional visitants! to the shores of Great Britain. The species 
are Culocephalus (Phoca) greenlandicus, Trichecus rosmarus, Delphinus Tursio, 
Delphinapterus (Beluga) leucas, Monodon Monoceros. 
In Aves, sixteen British and non-Irish species prevail in the western hemi- 
sphere. Of these, the Ptarmigan (Lagopus mutus) only can with certainty be 
termed indigenous to Great Britain, and for its absence from Ireland reasons 
have already been assigned. Linaria canescens seems not yet to be properly 
established as an indigenous British bird. Two species, Procellaria glacialis 
and Lobipes hyperboreus, are periodical visitants, the former to St. Kilda only, 
the latter to the northern Scottish islands. The remaining twelve are occa- 
sional and very rare visitants to Great Britain or the neighbouring seas. 
They are Nauclerus (Elanus) furcatus, Surnia funerea, Plectrophanes Lappo- 
nica, Ectopistes (Columba) migratoria, Macroramphus griseus, Tringa rufes- 
cens, Tringa pectoralis, Oidemia perspicillata, Clangula histrionica, Merganser 
-cucullatus, Larus atricilla, and Thalassidroma Wilsoni. 
In Reptilia, two species which have a place in the British and not in the 
. Irish catalogue, belong to the western hemisphere : these are Chelonia imbricata 
and Sphargis coriacea. 
In Amphibia, none of the species under consideration occur in the west. 
In Pisces, several British and non-Irish species appear in the North Ameri- 
-ean list, but they are all known only as rare and occasional visitants to the 
shores of Great Britain: They are Zrichiurus lepturus, Sebastes norvegicus, 
Naucrates Ductor, Exoceius exiliens, Engraulis encrasicholus ?, Echeneis Re- 
mora, Murena vulgaris ?, Zygena malleus, Scopelus Humboldtii, and Xiphias 
gladius. 
The Mammalia, Reptilia, and Pisces of the West are taken (with the excep- 
tion of Sphargis coriacea) from Dr. Richardson’s “ Report on North American 
Zoology,’’ (Report Brit. Assoc., vol. v.), and Dr. H. Storer’s “ Report on the 
Fishes &c. of Massachusetts ;” Aves, from the Prince of Musignano’s “ Com- 
parative Catalogue of the Birds of Europe and North America.” 
1 Throughout this Report, the term indigenous is applied to species perma- 
nently resident; periodical visitant, to those which come annually; occasionaé 
-visitant, to those met with at uncertain intervals. 
