Frof. T. R. Jones and W. K. Parlier — On Foraminifera. 511 



Berlin Academy, as the English specimens. Studied in the same 

 manner as the latter, these French forms appear to us to belong to 

 the following species and notable varieties : — 



Lagena glohosa, Montagu. Verneuilina pygmma, Egger. 



Hodosaria ovicula, D'Urb. Folymorphina Thouini, D'Orb. 



Boiivina punctata, D'Orb. SphcBroidina bulloides, D'Orb. sp. 



Virgulina squamosa, D'Orb. Cristellaria cultrata, Montf. sp. 



Schreibersii, D'Orb. Globigerina cretacea, D'Orb. 



Textilaria striata, Ehr. Planorbulina ammonoides, Rss. sp. 



gibbosa, D'Orb. Flanorbulinajareta, F. & M. sp. ; small 



aculeata, Ehr. varieties. 



sagittula, Defrance. Fulvinulina truncatulinoides, D'Orb. sp. 



agglutinans, D'Orb. Micheliniana, D'Orb. sp. 



Seterostomella aouleata, Ehr. sp. (See above, page 510.) 



These may be with advantage compared with the Foraminifera 

 from the Chalk near Paris, described and figured by Alcide D'Orbigny, 

 in 1840, " Mem. Soc. Geol. France," vol. iv., part 1, pi. 1-4. We 

 must, however, premise that, to bring all to the same terms of com- 

 parison, some of the generic terms used for these Foraminifera in 

 1840 have now to be altered, thus : — 



Rotalina Voltziana= Planorbulina. Rosalina Lorneiana\ _-pi„„.„-L,iii,^n 



I Mtelielimana = Fulvinulina. Ulementiana) 



■ umbilicata = Rotalia. Uvigerina tricarinata = Tritaxia (near 



' crassa 



Cordieriana ^ ^* ' Pyrulina acuminata = Folymorphina. 



Sagrina rugosa = Heterostomella. 



A full list of D'Orbigny's species from the Chalk is given in Mr. 

 Weaver's Appendix to his Abstract of Ehrenberg's Memoirs, Ann. 

 Nat. Hist., vii., p. 395, etc. ; together with notes on their localities 

 and distribution in France, England, and elsewhere. 



Lastly, we must not lose sight of the fact that the specimens 

 figured in the " Mikrogeologie " are for the most part very minute, 

 such as lie among the finer debris of washed Chalk ; whilst those 

 treated of by D'Orbigny were larger individuals picked out by means 

 of hand-lenses from the coarser dust of the disintegrated material. 

 The great difierence of size, however, among individual Foraminifera 

 carries but little weight in the determination of species ; for the con- 

 ditions, not only of growth, but of feeding-ground, depth of water, 

 and climate afi*ect them so greatly, that a form which may be gigantic 

 in one Jiahitat, will be arrested or dwarfed in another, retaining all 

 the essential characteristics of shape and structure which are re- 

 quired for its specific identification. 



nsroTiCES OIF- iMiiBDynoiE/S. 



On the Geology of the Kingscleke Valley. 



A Lecture addressed to Newbury District Field Club, during an Excursion, 

 on September 19, 1871. 



PEOFESSOE EUPEET JONES, who took his stand on the 

 northern edge of Ladel Hill, from which an extensive view of 

 the country was obtained, proceeded to deliver a lecture " On the 



