JO French National Injlitute. 



fay, an animal which walks on its hind legs alone. Olivier 

 has rectified this error by his own obfervation, which, on 

 this point, perfectly agrees with the ftru&ure of the body of 

 the animal, as it does not allow it to remain long upright on 

 its tarfi. 



The penis of this quadruped, as obferved by Sonnini *, 

 is furnifhed with two long offeous hooks near each other, 

 and placed towards the middle of the upper part of the glans. 

 The latter is guarded befides with papilla?, almoft of an offeous 

 nature, bent back and fhaped likeafpoon. In the alattaga, the 

 tnus jaculans of Pallas, the glans is merely covered with pa- 

 pilla, in the form of fpikes, almoft ftraight, rounded and 

 direfted backwards. The tefticles are concealed in the ab- 

 domen ; and the orifice of the vulva in the female appears 

 to be confounded with that of the anus. 



The defcription which Olivier gives of a fmall fpecies 

 found by him in Egypt, and which, in fize, is nearly equal 

 to that of a rat, is perfectly applicable to the mus longipes 

 of Linnasus ; except that the latter, according to Linnaeus, 

 has only four toes on the fore feet, while that of Olivier 

 has five; but it may be poffible, fays Olivier, that Linnaeus 

 did not pay attention to the thumb, which is indeed very 

 fhort. 



As there is great confufion in the fynonymy of authors, 

 Olivier endeavours, at the end of his memoir, to re&ify their 

 miftakes. At the fame time he gives the fpecific charac- 

 ters of the fpecies, which, in his opinion, belong to that 

 genus. 



1. Dipus cerfer pedibus pofticis tetrada&ylis. 



2. Dipusjerboa pedibus pofticis trida£tylis. 



3. Dipus alaElaga pedibus pofticis pentada&ylis, latera- 

 libus multo brevioribus. 



4. Dipus gerbillus fupra flavus fubtus albus ; pedibus 

 pofticis pentadaftylis, digitis fubaequalibus. 



Decandolle communicated to the Firft Clafs of the Infti- 

 tute a monography of the bilocular leguminous plants. 



Thebilocular leguminous plants are thofe, the fruit of which 

 are divided into two cells by a longitudinal partition, com- 



* Voyage ~en Egyp'.e, Vol. I. p. 133. 



pletc 



