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IX. The Characters of seven Genera of Bats with foUaccous 

 Appendages to the Nose. By William El ford Leach, M.D. 

 F.R.S. and L.S. 



Read March 7, 1820. 



I have the pleasure of communicating to the Linnean Society 

 the characters of five genera of the Datura] family of H.its which 

 have not hitherto been observed by naturalists ; and I add tin- 

 distinguishing marks of Vampyrus, a genus lately indicated, 

 but no where characterized, by my friend the Chevalier Geoffrey 

 St. Hillaire, who in a former paper, to which he has referred, had 

 neither described nor figured the posterior molaris of the upper 

 jaw*. 



The details of Megaderma Geoff, are also given, not only 

 for the purpose of showing the characters of its grinding teeth 

 and its affinity with Nyctophilus, but to prove that the cha- 

 racters which Cuvier has attributed to that genus, with some de- 

 gree of doubt, are perfectly correct (Regne Anim. i. 127-)> 

 namely, the absence of the superior incisors. 



On a future occasion it is my intention to lay before the So- 

 ciety the details of all such new genera as may be discovered by 

 my friends in different parts of the world, which shall be fol- 

 lowed with descriptions of all the species. 



To further my purpose, I solicit the aid of travelling natu- 

 ralists, and request them to have the goodness to send me speci- 

 mens of Bats (preserved if possible in spirits) from every part of 

 the world. 



* Annal. de Mus. xv. 184. pi 2. 



vol. xni. l VESPER- 



