Zoological Proceedings of Societies. 269 



Misloire Naturelle des Mammiferes. By Geoffroy St. 

 Hilaire and Frederic Cuvier. 

 This magnificent work, which has been suspended for a short 

 •time, in order to collect new materials, is now about to be recom- 

 menced. In the 44th, 45th, and 46th Livr., will be given Titles 

 and Indexes to the two volumes already published. An edition of 

 a, similar work, in 4to, is announced at the same time, destined to 

 •supply the place of the larger work, at a cheaper rate. 



* l Species Conchyllorum" 

 Messrs. Sowerby announce their intention of publishing in 

 Numbers, coloured figures and descriptions of all the Species of 

 Shells, whether recent or fossil ; including, with those that are at 

 present described, such other species as have not yet been noticed 

 in other works. 



Art. XL. Proceedings of Learned Societies on subjects 

 connected with Zoology. 



ROYAL SOCIETY. 



Feb. 1 9. — A paper was read, On the Semidecussation of the 

 Optic Nerves; by'W. H. Wollaston, M.D. V.P.R.S." 



It has been generally concluded by anatomists, and they support 

 the conclusion from the observation of the arrangement of the 

 optic nerves as distinctly seen in certain kinds of Fishes, that in the 

 human eye, the optic nerves, after passing from the thalami ner- 

 vorum opticorum, meet, and then proceed apparently in union, 

 though in reality still separate ; so that the right eye is believed 

 to be entirely supplied with these nerves from the left thalamus, 

 and the left eye from the right thalamus ; and this arrangement 

 is called the decussation of the optic nerves. The consideration 



