Notices of Memoirs — Malvern Rocks — Beach Formation. 473 



It is suggested that registered types should be quoted as B 1, 

 B 13 — e.g. Terehratxda biplicnta, B 1, or Phacops caudatiis, B 13 — B 

 •standing for British, and the number for that of the year of the 

 century. Specimens differing notably from the type, but included 

 in the same species, might be quoted as (B 1). 



VII. — On the Igneous Eocks associated with the Cambrian 

 Beds of Malvern.^ By Professor Theodore Groom, M.A., D.Sc. 



THE igneous rocks of the Cambrian beds of the Southern Malverns 

 have commonly been regarded as of volcanic origin. The author, 

 after a careful examination of the rocks under the microscope, and 

 of the ground, concludes that the scoriae and tuffs previously 

 described ai'e non-existent, and that the whole of the igneous rocks 

 are probably intrusive. They consist of sills and small laccolites 

 of basic and ultra-basic olivine diabase and olivine basalt, in which 

 olivine is often extremely abundant, and of bosses and dykes of 

 peculiar amphibole bearing andesites and andesitic basalts. Intrusion 

 probably took place in Ordovician times. 



VIII. — Beaoh Fokmation in the Thirlmere Eeservoir. By E. D. 

 Oldham, F.G.S., Geological Survey of India.' 



READEES of Mr. Marr's book on the " Scientific Study of Scenery" 

 will recall the comparison made by the author between the 

 irregular and angular outline of the Thirlmere Lake Eeservoir, 

 due to the submergence of a land surface sliaped by subaerial 

 denudation, and the more gracefully curved outline of the natural 

 lakes, where wind, waves, and streams have combined to I'ound off 

 the angularities by wearing away the prominences and filling up the 

 re-entering angles. This reproach seems to the author to be some- 

 what exaggerated, as the shore-lines of the Cumberland Lakes have 

 only been partially remodelled by wave action and delta formation, 

 and the original outlines due to simple submergence are still to be 

 seen. However this may be, the reproach, such as it is, is in 

 process of removal. All along the shore of the Thirlmere Lake 

 incipient beach erosion is to be seen, and towards the northern end 

 of the lake, where the shores close in and are exposed to the force of 

 the waves driven along the length of the lake by the prevailing 

 southerly winds, typical beaches and beach -curves are being 

 developed. [Lantern-slides showing the as yet incompleted transition 

 from the irregular outlines produced by submergence to the regular 

 curves of beach-formation were exhibited, and attention drawn to 

 this interesting opportunity of witnessing the gradual formation and 

 growth of a beach.] 

 IX. — Eeport of the Committee appointed to compile an Index 



Animalium : Dr. Henry Woodward (Chairman), Mr. W. E. 



HoYLE, Mr. E. MacLaohlan, Dr. P. L. Sclater, Eev. T. E. E. 



Stebbing, and Mr. F. A. Bather (Secretary).' 



THE Committee has the honour to report that this work has made 

 very satisfactory progress in the hands of Mr. C. Davies 

 Sherborn, and that the literature down to the year 1800 has now 

 ' Eead before the British Association, Section C (Geology), Bradford, Sept., 1900. 



