Reports and Proceedings — Geological Society of London. 237 



tingaished between " types " and those specimens merely noticed 

 or figured, his work would have been of much greater use. More- 

 over, personal expressions of opinion, which may be right or may 

 be wrong, seem quite out of place in a list of this kind, which 

 ought to be nothing more than an index to the origin of certain 

 names that have been used in Systematic Palaeontology. 



laiBI^OI^TS J^1<T1D leiaOGIBIEJIDXIsra-S. 



Geological Society of London. 



I— March 23rd, 1892.— W. H. Hudleston, Esq., M.A., F.R.S., 

 President, in the Chair. — The following communications were read : 



1. " On the Occurrence of the so-called Viverra HastingsicB of 

 Hordwell in the French Phosphorites." By E. Lydekker, Esq., 

 B.A., F.G.S. 



The author shows that Viverra Hastingsics, Davies, is common to 

 the Oligocene of France and Hordwell, and finding that there is no 

 character by which the lower jaw of the tyipe of the latter can be 

 satisfactorily distinguished from the type of V. ajigustidens, Filhol, 

 he considers that V. Rastingsice is specifically inseparable from 

 V. angustidens, and figures the cranium which is the subject of the 

 communication under the latter and earlier name. 



He gives a list of seven mammals known to be common to the 

 Headon beds of Hordwell and the Isle of Wight, and the French 

 Phosphorites. 



2. " Note on two Dinosaurian Foot-bones from the Wealden." 

 By R. Lydekker, Esq., B.A., F.G.S. 



In this paper the third right metapodial (metacarpal ?) and an 

 associated phalangeal of a Sauropodous Dinosaur, obtained by Mr. 

 C. Dawson from the bone-bed of the Wadhurst Clay, are described, 

 and referred with doubt to Morosaurus. 



The author also discusses the relationship of AcantJiopJiolis platypus 

 from the Cambridge Greensand. 



3. " On the Microscopic Structure, and residues insoluble in 

 Hydrochloric Acid, in the Devonian Limestone of South Devon." 

 By Edw. Wethered, Esq., F.G.S., F.C.S., F.R.M.S. 



Microscopic examination of the Devonian Limestones of South 

 Devon shows that they have been built up by calcareous organisms, 

 but that the outlines of the structure have for the most part become 

 obliterated by molecular changes, and the limestones are often 

 rendered crystalline. In connexion with this the author alludes to 

 the disturbances which have affected the limestones. He finds 

 occasional rhombohedra of dolomite, and discusses the probability 

 of their derivation from magnesian silicates contained in the rocks. 



A description of the insoluble residues follows. The micas, the 

 author considers, may be of detrital origin, but this is by no means 

 certain ; he is disposed to consider that the zircons, tourmaline, and 

 ordinaiy rutile were liberated by the decomposition of crystals in 



