1825. J theological Society/. " ^i f4g 



since 1816. It seems to be quite naturalized there, and to pro- 

 pagate abundantly. A paper was also read on the Crepitacula 

 and Organs of Sound in Orthopterous Insects ; and particularly" 

 in the Locusta camellifolia, a description of which is subjoined ; 

 by the Rev. Lansdown Guilding, BA. FLS. 



J line 21. — ^The following papers were read : — A Descriptive 

 Catalogue of the Australian Birds in the Cabinet of the Linnean 

 Society; by Thomas Horsfield, MD. FLS. and N. A. Vigors, 

 Esq. FLS. : communicated by the Zoological Club of the Lin- 

 nean Society, In the introductory remarks to this Catalogue, 

 most of the species described in which are of great interest, the 

 writers express their confident expectation that the deficiency 

 of our knowledge of the habits of the birds of Australia will be 

 in great measure supplied by the exertions of Mr. A. Mac Leay, 

 during his future residence in that interesting country. — A 

 Notice on a peculiar Property of a Species of Echinus ; by E.T. 

 Bennett, FLS. : communicated by the Zoological Club. 



The Society then adjourned to the 1st of I|^Yember ne^i, 



GEOLOGICAL SOCIEtY.'^^'^ 



May 6. — A paper was read, entitled " A Brief Description of 

 an extensive Hollow or Fissure, recently discovered at the Quar- 

 ries near the Extremity of the,3Kesjtern Hoe, Plynao,^|^,^ ^l^y the 



Rev. Richard HennaVjolxi/Tbififi: . ..^-^«»^^^n, 



In this communication the author describes an extensive 



hollow or cave in the limestone rocks near Plymouth, in which 

 no remarkable bones have yet been discovered, but in which 

 stalactites are particularly abundant. Mr. Hennah offers some 

 remarks on the various causes and circumstances which have 

 contributed to give to thesf , stal^qtitejs th^i^4\8^^^§L^_teP^^ ^"^^ 

 compositions. . . uA nl ,rfii ; .3 .lii8 lo^onsasm 9x1:^,; 



A paper entitled " On a Dyke of Serpentine cutttng through 

 Sandstone in the County of Forfar;" by Charles Lyell, Esq. 

 Sec. GS. was read in part. 



May 20. — The reading of Mr. Lyell's paper was concluded,;, ' 



In the former part of this paper, the rocks which are exposed 



on the left bank of the Carity, a small river in Forfarshire, which 



descends from the mica-schist district of the Grampians into 



Strathmore, are described. The first of these is a claystone 



porphyry, next to it is a conglomerate containing quartz pebbles, 



and then strata of fine grained micaceous sandstone and shale, 



dipping to the south, and which are suddenly cut off at an angle 



by the serpentine. These strata of sandstone ' and shale form 



part of a great series which overlies the clay slate to which it 



jjinmediately succeeds, and is older than the great conglomerate 



5^6th,^,Qi4.fe4)§aft^&fc^iWhich lies immedia,^4y ^B^" >ltimW® 



