Bibliographical Notices. 439 



graph in this work, is a more extensive group than either of the two 

 already treated of. It consists of eleven European species, of which 

 no less than four appear to have been first discovered or described by 

 M. De Serys-Longchamps himself. They are all arranged under two 

 sections, each of which is further divided into two others. 



I. The first section consists of those species which have the ex- 

 ternal ears shorter than the fur, often almost none at all : eyes very 

 small. 



This section comprises the two subordinate groups of (1.) Cam- 

 pagnols aquatiques (Hemiotomys, De Selys,) including A. amphi- 

 bius, Lacep. ; A. monticola, De Selys ; A. destructor, Savi, and 

 A. terrestris, Savi : and (2.) Campagnols Lemmings (Microtus, 

 De Selys,) including the A. fulvus of Desmarest, and the A. Savii 

 of De Selys. 



II. The second section consists of those species which have the 

 external ears as long as the fur and well developed ; eyes varying, often 

 prominent. 



This section is subdivided into the two groups of (1.) Campagnols 

 proprement dits (Arvicola,) including the A. subterraneus, De Selys ; 

 A. arvalis, Lacep. ; A. socialis, Desm. ; A. duodecim-costatus, De 

 Selys: and (2.) Campagnols murins (Myodes, De Selys), which last 

 group is instituted for the reception of the A. rubidus, De Selys (the 

 A. riparia of Yarrell), which is stated, on the authority of Nathusius, 

 to have the molar teeth with fangs in the adult state, a character 

 wherein it differs from all the other species of the genus. 



M. De Selys-Longchamps states that the genus Mynomes of Rafi- 

 nesque forms a third section characterized by its scaly tail. It is not 

 his intention, however, to raise any of these sections to the rank of 

 a genus or a subgenus. He observes that they all pass into each other 

 by insensible differences in the length of the tail and ears ; and in 

 regard to the character derived from the fangs of the teeth, that it 

 probably exists more or less in other species. And in imposing Latin 

 names on these groups, taken from among the synonyms of the ge- 

 nus, his only object has been to give foreigners an idea of the differ- 

 ent names which he has used in French. 



It has been already stated that four of the above species were first 

 discovered or described by M. De Selys-Longchamps himself. These 

 are the A. monticola, the A. Savii, the A. subterraneus, and the A. 

 duodecim-costatus ; and it may be useful to repeat here their respect- 

 ive characters, as they are probably not much known to the natu- 

 ralists of this country, although three of these species have already 

 appeared in the ' Revue Zoologique,' and the fourth has been de- 



