134 PROCEEDINGS OF THE 



importance in the history of these animals, for in many genera, 

 and particularly in Limnadia, we had hitherto been unable to 

 distinguish the sexes, and had consequently considered them 

 hermaphrodites ; in the specimens before him, from Arzen and 

 Russia, there was not the least doubt of the existence of dis- 

 tinct sexes. The males were invariably without eggs, and 

 were furnished moreover at the anterior part of their body with 

 two pair of appendages,. terminating in points, and with stout 

 claws, with which they, without doubt, seized the females, and 

 held them during the act of copulation. The females are 

 without these organs, and are provided with ovaries filled 

 with eggs. M. Audouin terminated his address by submitting 

 to the Society some minute Crustacea of the genus Lynceus, 

 probably the L. hraGhyurus of Muller. They had been for- 

 warded to him by M. Waga, the distinguished professor of 

 Natural History at Warsaw. Although but three millimeters 

 in length, they were considered as giant Entomostracea, com- 

 pared with Daplinea and Cypris; yet were dwarfs in comparison 

 with Limnadia and Cyzicus. The Lyncei also possessed dis- 

 tinct sexes. M, Audouin will recur to these peculiarities in a 

 memoir which he is preparing on various animals. 



The following papers were read : — 



Description of the LihelluUna of the neighbourhood of Aix, 

 by M. BoYER de Fonscolombe. 



Description of a new species of the genus Adena, by M. 



PlERRET. 



Memoir on two Tlnece which attack the olive, by M. Boyer 

 de Fonscolombe. 



M. Ahrens, of Augsburgh, was admitted a member of the 

 Society. 



Sitting of the 15th of February, 1837. 



M. Audouin in the Chair. 



The following donations were announced : — 



M. DupoNT. His Monograph of the Trachyderldes, ex- 

 tracted from the Magazine of Zoology. 



MM. Castelneau and Gory. The 11th number of their 

 Natural History, and Iconography of Coleoptera. 



The Secretary read a second time the letter from M. Gue- 

 RiN, resigning his membership in the Society. On this subject 

 Col. Feisthamel, Vice-President of the Society during the 



