Bibliographical Notices. 441 



along with the crania of several other species of Arvicola, in three 

 plates which accompany the present work. 



The A. terrestris is the A. argentoratensis of Desmarest and Les- 

 son. It is not the A. terrestris of the * Fauna Italica,* this last being 

 the same as the A. destructor mentioned above. 



To each of the three monographs in this work is annexed a tabular 

 arrangement of the dimensions of all the species contained in the 

 respective genera. And in the case of the Arvicolte, there are added 

 two other tables ; one exhibiting the relative characters of the crania 

 in the different species, the other the number of the ribs and ver- 

 tebrae. 



The work concludes with a complete list of all the Mammalia 

 hitherto discovered in Europe, amounting to 188 species, exclusively 

 of those which have been introduced by man, and which are only 

 domesticated. 



We have dwelt the longer on this work in the hope that it may 

 stimulate naturalists to making further researches in our own country. 

 Notwithstanding the labours of M. De Selys-Longchamps, and the 

 pains which he has taken in the monographs above noticed, we are 

 satisfied that the subject is not yet exhausted. There are several 

 species in the three genera of Sorex, Mus, and Arvicola which re- 

 quire further investigation, and doubtless some which remain yet to 

 be discovered. The British Shrews are not entirely cleared up. We 

 have also more than once had submitted to our examination speci- 

 mens of a mouse from the tops of the Irish mountains, closely allied 

 to the M. sylvaticus, but apparently offering some differences : un- 

 fortunately they were not in a sufficiently good state of preservation 

 to allow of any decided opinion respecting them. We may further 

 add that it appears doubtful whether we have not in our museums 

 two species of Arvicola confounded under the name of A. agrestis or 

 arvalis, one of which is the true A. arvalis of M. De Selys-Long- 

 champs, but the other so far distinct as not to have been immediately 

 recognised by this naturalist when specimens were submitted to his 

 view during his recent visit to this country. Ireland again seems to 

 possess a species of this genus which it is likely will be found differ- 

 ent from all those hitherto recorded as natives of Great Britain. But 

 further remarks on some of these points will probably be brought 

 under the notice of our readers before long. 



