Temminck's Monographies de Mammalogie. 463 



species as M. Temminck has hitherto been unable personally to 

 examine. It includes the characters of the Nyctinomus acetalm- 

 losus^ Geoff, and Nyct. dilatatus^ Horsf., which inhabit the Old 

 World ; and refers to the following, described by authours as 

 having been discovered in the New World : Dys, ater^ Geoff., 

 Molosse MuloUvolant^ Daubent., Molossus fusciventer^ Geo^.^ the 

 Chauve-souris chataine^ obscure^ and brun-c.annelle, of D'Azara, 

 the Chauve-souris de la Guyane of Buffon, and the Dys. acutkau' 

 datus^ Desm. The latter may probably be the type of the genus 

 Thyroptera^ Spix. To these M. Temminck subsequently adds in 

 his Appendix the Dinops Ceston? Savi, which he suspects to be a 

 species of Dysopes^ closely allied to his Dys. RuppeliL 



Figures of all the new species, except the Dys. riifus, accom- 

 pany the descriptions. There are also given figures of the Dys, 

 eheiropus^ Geoffroyi^ tenuis^ and obscurus ; the former being 

 copied from the Zoological Researches in Java, and the second 

 from the Description de I'Egypte. Other plates exhibit skeletons 

 of two of the species, and crania of many of them ; in the latter 

 the dentary system at various ages is particularly explained. 



In his seventh Monograph, M. Temminck proposes a new genus 

 of Rodentia^ to which he gives the name of Aulacodus. It is 

 founded on a single individual of a species hitherto unnoticed. 

 From the very early age of the specimen the generic characters 

 cannot be regarded as fixed ; those especially which are derived 

 from the teeth differing of course as the animal advances in growth. 

 The superior incisors are deeply channelled, with two grcoves in 

 each of them ; the molars are, in this instance, only two on each 

 side in each jaw, and bear some resemblance to those of Arctomys: 

 it has no cheek-pouches ; there are four toes to each of the feet, 

 the skeleton exhibiting the rudiments of a fifth i the tail is entirely 

 covered with hairs, its length being less than one-half of that of 

 the head and body taken together : and the ears are very large, 

 their external margin forming a Complete semicircle, and the 

 conch being furnished with several membranous appendages. 



The only species is the Aul. Swinderianus. Its size is rather 

 larger than that of theHypudosus amphibius, (Water Campaguol,) 



