376 Reports and Proceedings — 



The genus differs from Fungia in having the spaces on the inter- 

 costal grooves and the bars of the synapticulaj i-egular. 



Some small corals lately brought from the Korean Sea have the 

 shape, synapticulate arrangement and bifurcating costae of Micrabacia ; 

 but the corallum resembles in its bipartite unsymmetrical growth the 

 genus Dioseris of the Lophoserinte. 



Micrabacia Fittoni, described by the author in 1866, from the 

 Gault, is placed in the same genus as M. coronula with much doubt. 

 The type has been mislaid, and the figures exhibit characters some 

 of which resemble those of M. coronula ; but in the absence of the 

 specimen, it is not quite certain what are the structures represented. 



4. " A Correction in the assumed Amount of Energy developed by 

 the secular Cooling of the Earth as stated in two Papers by the late 

 Eobert Mallet, M.A., F.R.S., in the 'Philosophical Transactions,' 

 1874-5." By W. F. Stanley, Esq., F.G.S. 



According to Mr. Mallet, the amount of heat lost from the initial 

 temperature of the earth will represent the force of its contraction. 

 To this force he attributes the inclination and crumpling of strata, 

 together with all volcanic phenomena. He states that the calcula- 

 tions of Elie de Beaumont, Forbes, and Sir William Thomson, 0*0065, 

 0-007, and 0'0085 millim. respectively, represent the thickness of a 

 plate of ice covering the earth, which, melted, would equal the heat 

 lost annually. From these data he calculates that from 575 to 777 

 cubic miles of ice, melted, would represent the loss of heat. This 

 calculation was shown to be entirely in error. According to the data 

 an amount of energy represented by the melting of from -7937 to 

 1-0387 cubic mile of ice only would be dissipated, or about a 7G0th 

 part of the amount estimated by Mr. Mallet, 



IL— June 25, 1884.— Prof. T. G. Bonney, President, in the Chair. 



1. "Additional Notes on the Jurassic Eocks which underlie 

 London." By Prof. John W. Judd, F.E.S., Sec. G.S. 



Since the reading of the former paper on the subject (February 6, 

 1884), the well-boring at Eichmond has been carried to a depth 

 of more than 1360 feet. The point reached is, reckoning from 

 Ordnance-datum line, 220 feet lower than that attained by any other 

 boring in the London basin. 



A temporary cessation of the work has permitted Mr. Collett 

 Homersham to make a more exact determination of the underground 

 temperature at Eichmond. At a depth of 1337 feet from the sur- 

 face, this was found to be 75^° F., corresponding to a rise of tem- 

 perature of 1° F. for every 52-43 feet of descent. 



The boring is still being carried on in the same red sandstones 

 and " marls," exhibiting much false-bedding, which were described 

 in the previous communication. 



The Eev. H. H. Winwood, of Bath, has had the good fortune to 

 find the original fossils obtained by the late Mr. C. Moore from 

 the Oolitic Limestone in the boring at Meux's Brewery in 1878. A 

 careful study of these proves that though less numerous and in 

 a far less perfect state of preservation than the fossils from the 

 Eichmond well, they in many cases belong to the same species, and 

 demonstrate the Great Oolite age of the strata in which they occurred. 



