Intelligence and Miscellaneous Articles. 207 



II. On Palceacis Jiumilis, sp. nov., a new Perforate Coral ; with 

 Remarks on the Genus. III. On the Jaw-apparatus of an Annelid, 

 Eunicites Eeidii, sp. nov.' By George Jennings Hinde, Ph.D., 

 F.G.S. 



2. 'The Eocene Deposits of Dorset.' By Clement Reid, Esq., 

 F.L.S., F.G.S. 



The new survey of the western end of the Hampshire Basin 

 shows that the Reading Beds become fluviatile and gravelly in 

 Dorset (as was already known), and contain, in addition to Chalk 

 flints, many fragments of Greensand chert. The London Clay thins 

 greatly and becomes more sandy, but is apparently still marine. The 

 Bagshot Sands become coarser and more fluviatile, changing rapidly 

 west of Moreton Station, till they consist mainly of coarse subangular 

 gravel. These gravels, formerly referred to the Reading Series, are 

 now shown to be continuous with the Bagshot Sands, which as they 

 become coarser cut through the London Clay and Reading Beds to 

 rest directly on the Chalk. The Bagshot gravels contain, besides 

 Chalk flints and Greensand chert, fragments of Purbeck marble and 

 numerous Palaeozoic grits and other stones probably derived from 

 the Permian breccias of Devon. 



Thus there is evidence of disturbance and overlap in Cretaceous 

 or early Eocene times, causing Reading Beds to rest on Upper 

 Greensand. Later disturbances allowed the Bagshot river to cut 

 into Greensand, Wealden, Purbeck, Permian breccia, Culm Mea- 

 sures, and granite. Folding of the strata seems to have taken 

 place during at least four different periods in the district between 

 Dorchester and Weymouth, which appears to have been a region of 

 special weakness. 



The Eocene gravels contain all the foreign rocks known to occur 

 in the Plateau-gravels between Brighton and Dorchester. The 

 fragments of Greensand chert, so abundant in the Plateau-gravels, 

 have not been derived, as supposed, from the central axis of the 

 Weald. They come, as already-formed pebbles, from the Eocene of 

 Dorset, and originally from the Greensand of Devon. 



2. 'Discovery of Mammalian Remains in the Old River-gravels 

 of the Derwent near Derby.' — Part I. Bv H. H. Amold-Bemrcse. 

 Esq., M.A., F.G.S. ' 



XX. Intelligence and Miscellaneous Articles. 



ON THE REFRACTIVE INDICES OF SOME SUBSTANCES FOR VERY 

 SHORT ELECTRICAL WAVES. BY DR. A. LAMPA. 



r PHE wave-length of the rays of electrical force used was 8 millim. 

 -*- This number follows from the dimensions of the exciter, but 

 was also ascertained by means of an interference experiment. In 

 reference to the arrangement of the experiments, it may be ob- 

 served that a coherer was used for demonstrating the electrical 

 rays. Experiments showed that in the experiment on refraction it 

 is possible to get a pretty sharp adjustment for the maximum 



