1868.] PRKSTAVICH NOEFOLK AND SUFFOLK CEAG. 289 



geographical distribution of the existing species in the several zones, 

 and the present range of the organic remains. He agrees in the 

 opinion that the greater number of the Mammalian remains are ex- 

 traneous fossils ; but regards those of a whale as truly contempora- 

 neous, and probably also the teeth of the Hhinoceros and Mastodon^ 

 while the bones that are more or less drilled he considers to be de- 

 rived. The occurrence of a large block of porphyry in the basement- 

 bed at Sutton is considered a proof that a considerable degree of winter 

 cold had been attained at that period, as it would be difficult to ac- 

 count for its presence in that bed except by ice-action ; the autlior 

 also enumerates the physical conditions which seem to be suggef^ ted 

 by the mineral character and the structure of the several zones, in- 

 ferring, from the peculiar mixture of southern forms of life v^-ith 

 others of a more northern type, that at this early period the setting- 

 in of conditions of considerable cold had commenced. 



With the aid of Mr. Gwyn Jeffreys the author has revised the 

 list of MoUusca from the Coralline Crag ; and he gives a Table in 

 which the range of the species in space, depth, and time is exhibited 

 and an analysis of their synonymy by Mr. Jeffrej^s. He also dis- 

 cusses the relations of the Coralline Crag to its foreign equiva- 

 lents, agreeing in the conclusion that the Crag Noir is a stage older 

 than it, while the destruction of beds of the age of some of the older 

 Crags of Belgium have furnished many of its derived fossils. In 

 conclusion the author describes the distribution of sea and land at 

 the period of the deposition of the Coralline Crag, as suggested by 

 the affinities of the fossils of that deposit. 



Maech 25, 1868. 



John Tyndall, LL.D., F.E.S., &c., Professor of Natural PhHo- 

 sophy in the Eoyal Institution and the Eoyal School of Mines ; 

 Allan Curr, Esq., Dora Terrace, Brixton Eoad ; and Charles William 

 Fothergill, Esq., Captain Eoyal Marine Artillery, Woolwich, were 

 elected Eellows. 



The following communications were read : — 



1. On some New Species of Ckustacea from the Upper SiLUiiiAN 

 EocKS of Lanarkshire Sfc. ; and further observations on the 

 Structure of Pterygotus. By Henry Woodward, Esq., F.G.S., 

 F.Z.S., of the British Museum. 



[Plates IX. & X.] 



Among the rich collection of fossil Crustacea from Logan Water, ex- 

 hibited by Mr. Eobert Slimon at the Meeting of the British Associa- 

 tion at Dundee, in September last, were several new forms belonging 

 to the order Merostomata, which have since been acquired by the 

 British Museum. 



I. The first new form is represented (PL IX. fig. 1) by (1) an 

 almost entire individual, measiii'ing 11 inches in length and 5 inches 



