124 Analytical Notices of Books. 



The names of the second, fifth, ninth and tenth of these genera 

 are new to science ; it is however necessary to offer a few remarks 

 as to the novelty of the groups to which they are applied. The 

 first of them, Brachyurus^ appears to be perfectly new, and deserv- 

 ing of the distinction applied to it : the second, Nyctipithecus^ 

 is given to a nocturnal group, to one of which most probably, 

 Humboldt, and subsequently Geoffroy, had given the generic 

 name of Aotus ; but as the whole of M. Spix's species possess 

 visible ears, this latter name becomes inapplicable, and the cha- 

 racters also require alteration : the third, Brachyteles, is formed 

 to receive the Ateles hypoxanthus of the Prince de Neuwied, 

 (the Lagothrix Humboldtii, Geoffroy), a necessary correction, as 

 the animal possesses a short thumb : and the last is probably syno- 

 nymous with the Lagothrix of Geoffroy, except that is more re- 

 stricted ia its characters. The Stentor of the latter author is 

 also in the preceding list exchanged for the earlier name of 

 Mycetes. 



Of the whole of the species enumerated above, as well as of 

 three others not previously figured, very detailed descriptions are 

 given in Latin, with observations in French on their respective 

 habits, and on their affinities. Each of them is also figured on a 

 separate plate, and coloured from nature. 



To distinguish the Bats of Brasil, which constitute the second 

 portion of the work, from those of the old continent, is more 

 difficult, since unlike the Monkeys, they do not form a separate 

 family at once recognisable by strong and peculiar characters. 

 Many of the genera of Bats are in fact common to both conti- 

 nents, and the only character pointed out by Geoffroy as distinc- 

 tive in one Brasilian genus, Phyllostoma^ that it possessed an ad- 

 ditional or fourth phalanx to the middle finger, is controverted 

 by M. Spix ; who states that the same may be found, although 

 very small, not only in all the other fingers in that genus, but also 

 in all other bats. The Brasilian bats are more frequently fur- 

 nished with membranaceous crests upon the nose than those of the 

 old continent, but as the whole of them do not possess this cha- 

 racter, and as one African and one European genus, Megadcrma 



