318 Bibliographical Notices. 



concluding words of Mr. Owen's most valuable observations, "It is 



highly interesting to find that the continent to which this existing 

 aberrant form of rodent is peculiar (the Hydroclucrus), should be 

 found to contain the remains of an extinct genus, characterized by a 

 dentition which closely resembles the rodent type, but manifesting it 

 on a gigantic scale, and tending to complete the chain of affinities 

 which links the pachydermatous with the rodent and cetaceous 



orders." 



The description of the remains of another large animal scarcely 

 less interesting is commenced in the concluding pages of the number, 

 but we shall not notice this until we receive its completion. Suffice 

 it to say now, that from the portions of the skeleton which have been 

 discovered containing no parts of the skull or teeth, the animal is 

 considered referable to the order Pachydermata, but with affinities to 

 the Ruminantia, and especially to the Camelidse. It has been named 

 Macrauchenia patachonica. 



The number is illustrated by seven well-executed lithographic 

 plates. 



A Geographical and Comparative List of the Birds of Europe and 

 North America. By Charles Lucian Bonaparte, Prince of Musi- 

 gnano. London. Van Voorst, 1838. 8vo. 



Although only a list of species, this is a valuable contribution to 

 geographical ornithology. Of the nomenclature and arrangement 

 we would not offer a remark, as the author says, " The genera are 

 arranged in these lists in families and tribes, according to the gene- 

 ral system of birds on which I have been long engaged, and which I 

 now hope very shortly to bring before the public." When this ap- 

 pears we shall give it due attention. We may state, however, that 

 the system of Boje is much used, at times too far, we think ; at the 

 same time, this little publication is of much use, as showing a cor- 

 rect list up to the latest knowledge of species indigenous or partly 

 visiting each country. In another respect it is also important : the 

 ornithology of North America has always been considered as very 

 closely allied to that of Europe, and the identification of species has 

 been perhaps overdone. The Prince of Musignano's catalogue gives 

 those common to both countries : his opinion is gathered from the 

 different name he has given to each, and, from the information which 

 we know this naturalist possesses of the Faunae of Europe and North 

 America, we consider it as bearing great weight ; at the same time 

 observing, that so far as our own more limited observations have 

 gone, we are not prepared always to coincide. The letter- press is 



