Linncean Society. — Geological Society. .175 



Description of several species, hitherto unpublished, of the 

 genus Coccinella ; by George Milne, Esq. F.L.S. communi- 

 cated from the Zoological Club. The new species are : C. cir- 

 cumdata, Brazil ; 28-maculata, N. Holland ; 1 8-maculata, 

 N. Holl. ; cor data, N. Amer.; connata, N. Amer. ; ^-fasciata ; 

 ephippia ; parva ; 6-guttata; decussata ,- abdominalis ; cyanea, 

 Brazil. 



Observations upon the Motacilla Hippolais of Linnaeus, by 

 the Rev. Revett Sheppard, F.L.S. communicated from the 

 Zoological Club. The conclusion come to by the Author is, 

 that the M. Hippolais of Linnaeus is the Greater Pettychaps. 



An Account of some Plants belonging to the Natural Order 

 called by Dr. Jack Cyrtandraceae, by Francis Hamilton, M.D. 

 F.L.S. The species described are Chclonejiliforme, rubicun- 

 da, and latifolia. 



GEOLOGICAL SOCIETY. 



Nov. 5. — A paper was read entitled " Observations on a 

 Comparison between the beds below the Chalk in the Isle of 

 Wight, and in the counties of Surrey, Kent, and Sussex;" 

 by Thomas Webster, Esq., Sec. G.S. 



Mr. Webster stated, that in a late visit to the Isle of Wight, 

 he had been so fortunate as to discover a rock of the same na- 

 ture as the calciferous sandstone of Hastings, a circumstance 

 that has furnished him with a fixed point, by means of which 

 he had been enabled to compare the beds in the Isle of Wight 

 with those of the S.E. part of England more correctly than 

 had been done before ; and he presented a table of what he 

 considered as the equivalent beds in these two places. 



He imagined that these equivalents had been hitherto stated 

 erroneously by several geologists ; and he attributed this 

 chiefly to the following causes. 1st, The imperfect state of 

 the science of geognosy, which had not as yet established fix- 

 ed principles of classification ; 2d, The want of acknowledged 

 Types of beds or formations to which all other parts might be 

 referred ; 3d, The difficulties attending actual examinations, 

 arising from the deficiencies or want of continuity of some 

 beds, and the variation in the composition and structure of 

 others, — difficulties which had, in his opinion, been under rated. 



The author then proceeded to point out in detail what he 

 conceived to be the history of some of the errors that had been 

 fallen into. Thus, until lately, the description given by va- 

 rious geologists of Che rock called green sand were supposed 

 to be applied to one bed only; whereas, in fact, there are two 

 beds distinct, from each other, the underclifl'of the Isle of 

 Wight, and the rock of T'olkstone, each of which had received 

 tin- denomination. Also in the groups which it had been found 



necessary 



