Geological Society/. 283 



against the principles which had been explained to the Club on 

 this and preceding evenings; and a lengthened discussion took 

 place on the subject, which was further postponed to a future 

 opportunity. 



June 28. — Mr. Swainson exhibited drawings of a species of 

 Bat, allied to Phyllostoma, which he had obtained during his^ 

 residence in Brazil. The original specimens being lost, he ex- 

 pressed his wish that the only vestige of the species which he now 

 possessed, should be rendered available to the purposes of science ; 

 and Mr. Brookes and Dr. Horsfield were therefore requested to 

 direct their attention to the subject, and report thereon to the 

 Club, Mr. Gray having promised to render assistance. 



Mr. Vigors exhibited to the Meeting specimens of the different 

 types of form that compose M. Brisson's generic group of Icterus, 

 This group he stated to compose one fifth division, or sub-family, 

 of the family of Sturnidce, and to consist of the five following 

 genera; viz. Cassicus, Daud., Quiscalusy Vieill., Icter us , Cmy., 

 Xanthornus, Cuv., and Leistes, which he had lately characterized* 

 as a genus intervening between Xanthornus and Cassicus, He ex- 

 plained the characteristic differences by which the typical species 

 iof these five groups are distinguished from each other, and the 

 affinities b}' which they are at the same time connected together. 

 He also exhibited specimens of two new species of the sub-family, 

 the Xanthornus Chri/sopterus, and Leistes Suchii, which he had 

 recently described. 



GEOLOGICAL SOCIETY. 



June 3. — A paper was read, entitled Remarks on Qua' 

 drupeds imbedded in recent alluvial strata; by C. Lyell, Esq. 

 Sec.G. S. 



In a former communication to the Society, the author bad stated 

 that he had found it difficult to explain the circumstances under 

 which the remains of Quadrupeds were very generally found im- 

 bedded in the shell marie in Scotland ; often at considerable 

 depths, and far from the borders of those lakes in which the marie 

 is accumulated. 



* See the present Number of our Journal, p. 182. 



