Notes on Eley's Foraminifera. 123 



flowing over land now submerged to a great depth, and which is, 

 moreover, covered with thick deposits forming the beds on which 

 rest the waters of these extensive gulfs ; therefore there must be 

 now in progress in different parts of the world formations which 

 will at least rival any recorded in Britain as having occurred in 

 Palaeozoic times. It may be presumed that the Ganges at one time 

 has extended southward to 10° or perhaps even to 5° north latitude ; 

 that the Mississippi has in all probability extended as far as the 

 longitude of Porto Eico. By the same reasoning the rivers now 

 emptying themselves into the Bay of Liverpool — the Lune, Eibble, 

 Mersey, Dee, Clwyd, and others — will, prior to the Glacial period, 

 have all converged and formed one large river emptying itself into 

 what is now the Irish Sea. 



If valleys have been formed, and inland areas and mountain chains 

 sculptured, by what is known as sub-aerial agencies, there appears to 

 be no other way than that advanced to account for the re-distribution 

 of the materials which have been removed. The phenomena of the 

 accumulation of material and of subsidence of the land are not 

 unfrequently alluded to by Sir Charles Lyell and others as occurring 

 simultaneously ; but it appears that none have considered that the one 

 is dependent upon the other, at least in reference to the present 

 subject.^ If Lyell does not venture to associate the two as cause 

 and effect, it is hardly to be expected that this theory will be accepted 

 without due consideration ; but it is a question which demands and 

 deserves a careful examination. 



Vn. — Notes on Eley's Foraminifeka from the English Chalk. 

 By Prof. T. Eupert Jones, F.G.S., and W. K Parker, F.E.S., F G.S. 



THE Foraminifera of the Chalk were treated of in Nos. 89 and 

 90 of the Geol. Mag., November and December, 1871, with 

 the view of aiding collectors and authors in their arrangement of 

 these numerous and puzzling microzoa in their catalogues and 

 cabinets. We shall be rendering further service to students, if we 

 refer them to the Eev. Henry Eley's clear and useful, though some- 

 what hard, drawings of the Foraminifera usually found in the 

 English Chalk and Flint. These were published in his " Geology 

 in the Garden ; or, the Fossils in the Flint Pebbles." 8vo. London, 

 1859. 



The nomenclature of the Foraminifera having been improved of 

 late years, we correct the names accordingly. 



pi. ii. figs. 3 and 4. Planorhulina ammonoides, Eeuss. Internal casts, p. 193. 



— figs. 5 and 6. Globigerina eretacea, D'Orb. Internal casts, p. 194. 



— fig. 7. Cristellaria ovalis, Reuss. Internal cast. p. 194. 



— fig. 8. Cristellaria rotulata, Lamarck. Internal cast. p. 194. 



Fig. 7 has a few large segments, and is oval ; fig. 8 has many 

 segments and is lenticular; figs. 7 and 8 are essentially the same, 

 as stated by Mr. Eley, but are separated for convenience. 



1 The principle is applied by Sir John Herschel to the subsidence of the bed of the 

 Pacific Ocean and its converse, the elevation of the Andes (Physical Geography 

 § 132), and also by Dr. Dawson, of Montreal, to account for the depression of the 

 strata during the Laurentian Period {Leisure Hour, 1871, page 119). 



