334 



W(h March, 1841. 



Dr ABERCROMBIE, V.P., in the Chair. 



1. On the Parallel Roads of Glen-Roy, with an Examination 



of Mr Darwin's Theory of their Formation, Part I. By 

 Sir T. D. Lauder, Bart. 



2. On the Polarizability of Heat from diflFerent Som'ces. By 



Professor Forbes. 



The author of this paper states in it his belief, that the curi- 

 ous fact formerly announced to the Society of the greater permea- 

 bility of mica, laminated by heat, to heat of low temperature, 

 contrary to the usual character of the same substance (a property 

 which he has since extended (see Proceedings, Jan. 1840) to 

 changes of mechanical conditions of surface), may very probably 

 explain, as M. Melloni anticipates, the difference in point of fact 

 long contested between them as to the equal or unequal polariza- 

 bility of heat from different sources. 



3. Accoimt of the Fossil Species of the genus Solarium, La- 



marck, found in the Supercretaceous group in Italy. By 

 M. le Chev. Michelotti of Turin. Communicated by Dr 

 Traill. 



This genus of shells belongs to the Class Gasteropoda of 

 Cuvier, and to the family Turbinacea of Lamarck, of which the 

 general character is to have the shell turreted or conoid, with the 

 aperture rounded or oblong, and the margin disunited. 



M. Michtlotti was induced to undertake the examination of 

 the fossil Italian species of this genus, from the doubts prevail- 

 ing regarding the identity of some of the species in the writings 

 of authors. He describes in all ten species, which are found in 

 the neighbourhood of Turin, of which four have not been pre- 

 viously noticed. The four newly described species are Solarium 

 neglectum, S. pulchellum, S. Lyellii, and S. huinile. Two of the 

 other species described, viz. S. Stramincum, Lamarck and S. hi- 

 tcum, have their living prototypes, — the first in the Indian and 

 Mediterranean Seas, and the second in the seas of New Holland. 

 The other species are, — 



