532 //. B. Brady — Fossil Foraminifera of Sumatra. 



expose their bare surfaces to the investigator. The knowledge of a 

 mountain's geognostic character, at which one in more southerly 

 countries can only arrive after long and laborious researches, re- 

 moval of soil and the like, is here gained almost at the first glance ; 

 and as we have never seen in Spitzbergen nor in Greenland, in 

 these sections often many miles in length, and including, one may say, 

 all formations from the Silurian to the Tertiary, any boulders even 

 as large as a child's head, there is not the smallest probability that 

 strata of any considerable extent, containing boulders, are to be found 

 in the Polar tracts previously to the middle of the Tertiary period. 



Since, then, both an examination of the geognostic condition, and 

 an investigation of the fossil flora and fauna of the polar lands, 

 show no signs of a Glacial era having existed in those parts be- 

 fore the termination of the Miocene period, we are fully justified 

 in rejecting, on the evidence of actual observation, the hypotheses 

 founded on purely theoretical speculations, which assume the many 

 times repeated alternation of warm and glacial climates between the 

 present time and the earliest geological ages. 



II. — On some Fossil Foraminifera from the West-Coast District, 



Sumatra. 



By Henry B. Brady, F.R.S., F.L.S., etc. 



(PLATES XIII. and XIY.) 



NOTE. — The Fossils about to be described were sent to England 

 in 1873 and 1874 by Heer E. D. M. Verbeek, Director of the 

 Geological Survey of Sumatra, and are here published by the authority 

 and with the aid of the Dutch-Indian Government. 



A general account of the geology of the West-Coast District of 

 Sumatra, by Heer Verbeek, is given in the Geological Magazine 

 for October, 1875, New Series, Vol. II. pp. 477-486. 



T. Eufert Jones. 



The series of fossil Foraminifera, collected by Heer Verbeek in 

 Sumatra, to which the following paper refers, were placed in my 

 hands by my friend Prof. T. Eupert Jones, F.E.S., F.G.S., for ex- 

 amination and description. Doubtful points in connexion with 

 them — for many of the specimens are more or less obscure — have 

 been determined after joint deliberation, and the views stated 

 throughout have been corroborated by my friend and collaborateur. 



1. Operculina granulosa, Leymerie. PI. XIII. Figs. 1, a, b, c. 



OjJercnlina granulosa, Leymerie, 1846, Mem. Soc. geol. France, 

 2 ser. vol. i. Mem., No. 8, p. 359, pi. 13, figs. 12 a, b, c. 



[Assilina undata, D'Orbigny, 1826, Ann. Sci. Nat. vii. p. 296, No. 3. 



Assilina undata, 1850, Prodrome de Paleont. vol. ii. p. 336, No. 

 684; fide D'Archiac, "Descr. Anim. foss. Groupe numm. de 

 ITnde," p. 157.] 



Amongst Heer Verbeek's fossil Foraminifera from Sumatra, the 



