Prof. T. R. Jones and W. K. Farher — On Foraminifera. 507 



fig. IV. ; and some of the species were quoted in the "Catalogue;" 

 but a more matured consideration was subsequently given them; 

 and, together with many others from other sources, recent and fossil, 

 they were most carefully figured and enumerated in the above- 

 mentioned magnificent work on Microzoa. In its fine folio plates, 

 so richly illustrating the Foraminiferal faunge of many localities, and 

 of many geological horizons, the artistic work is of high order in 

 the zoologist's eyes ; it is faithfully correct as to form, aspect, orna- 

 mentation, colour, and all details, modified, however, by the specimens 

 being mostly seen as transparent objects, with the thickness of the walls 

 rather too much pronounced at the edges ; the objects, too, are some- 

 v/hat in perspective. It being difficult to combine transparency and 

 perspective in a drawing, especially with the attending minutiae of 

 pores, tubercles, ridges, internal septa, septal apertures, and other cha- 

 racteristics of Foraminifera, the result is that the task of recognizing 

 the real zoological place of the figured forms is difficult, or impos- 

 sible, except to those who have long studied similar hosts of microzoa, 

 similarly mounted in Canada-balsam. Having had such advantages, 

 we feel called on to add to the list of British fossils, with our own 

 nomenclature, the Cretaceous Foraminifera of Gravesend, figured by 

 Ehrenberg. 



Though we differ very considerably in our estimation of generic 

 and specific distinctions and arrangement from this veteran naturalist, 

 as shown by the different appellations we decide to annex to his 

 figured specimens, yet we must remark that the divisions and collo- 

 cations of the figures on his plates in the " Mikrogeologie " are 

 generally quite natural, according to some characters, which Dr. 

 Ehrenberg has recognized, but not clearly elaborated, and which 

 agree to a very great extent with our own basis of generic arrange- 

 ment. 



In plate xxviii. of the Mikrogeologie are figured numerous Fora- 

 minifera from the soft Chalk of Gravesend, England.. They ai'e 

 magnified 300 times in linear dimensions. These are referred to in 

 the " Monatsberichte " of the Berlin Academy for 1838, pages 193, 

 194, where some of them are stated to have been found in the 

 Chalk of Brighton also, and in the " Abhandlungen " for 1838, as 

 stated above. An able abstract of this and another memoir in the 

 "Abhandlungen" was made by the late T. Weaver, F.E.S., F.G.S., 

 in 1841, and published in the " Phil Mag.," Nos. 118 and 119, and in 

 "Annals and Mag. Nat. Hist," vol. vii., pp. 296, 374, etc. ; and in 

 Taylor's " Scientific Memoirs," vol. iii. is a full translation, with 

 plates, of Ehrenberg's memoir " on the numerous animals of the 

 Chalk Formation which are still found living." Berlin Acad. 

 Transact, for 1840. 



The results of our careful examination of Ehrenberg's figures are 

 as follows : — 



Fig. 1. Miliola IcBvis is probably a single joint or a detached 

 chamber of a Nodosaria. Ehrenberg's Miliola is the same as 

 Lagena of other authors. 2. Nodosaria Anglica is N. ovicida, 

 D'Orb., with a rather excentric aperture. 3. N. monile is a variety 



