110 rROGDEDD^GS OF THE GEOLOGICAL SOCIETY. [Jan. 24, 



lleuss from tlio Bohcraian, the Westphalian, and other Cretaceous 

 formations, we here enumerate the lloxALiNiE which D'Orbigny 

 figured and described in 184G from the Miocene strata of the neigh- 

 bourhood of Vienna. And we reduce his nomenclature to that 

 adopted by ourselves, so that the comparison of varieties (or, rather, 

 in most cases, subvarieties) may readily be made by others. Were, 

 for instance, all the Cretaceous Planorbulinc liotaUme figured by 

 Keuss, and all these Tertiary Planorbulines figured by D'Orbigny, 

 copied out on a sheet of paper, and arranged in the order of their 

 alliances, a close specific relationship would be clearly observed, but 

 modified by varietal and subvarietal (or rather individual) differ- 

 ences, Avhich give the groups a dififerent fades. Bo also the several 

 Cretaceous faunas, local or successive, will be found to have somewhat 

 different fades, without changing much as to species and definite 

 varieties. 



For another reason, too, have we produced this critical list of the 

 fossil lioTALiNiE from Vienna, — because the naming of these and of 

 some of the German Cretaceous Foraminifera by Prof, lleuss was 

 contemporaneous. It is, however, the naming of the type (or average 

 form) of a group or subgroup that takes priority among Foramini- 

 fera, the names of minor varieties becoming merged in those of the 

 more important types, as we have stated elsewhere. 



The ' Foram. Foss. Bassin de Vienne,' is also an accessible book 

 for most students ; and other species determined by iJ'Orbigny in 

 former years can be readily found in the ' Ann. Nat. Hist.' of 1865 

 and 1871, in plates attached to memoirs by ourselves and our col- 

 league Mr. H. B. Brady. 



1. For the Planorhidince, which chiefly concern us now, it will be 

 remembered ih-di PI. far da (Fichtel & Moll) is the type ; PI. iuherosa 

 (F. & M.) is the subtype ; and aU other known forms of Planorhulina 

 can be grouped with one or the other of these. Or, in other words, 

 PI. farda may be termed the species, PI. tuherosa the chief variety, 

 and other forms inferior varieties of one or the other. This is zoolo- 

 gically true, though rather confusing. At all events, in indicating 

 i\iG predse relationships of the PJanorhuUnce, the latter plan has to 

 be followed. A critical account of PlanorhuUncis, PuJvinulince, Dle- 

 corbince, and Potalice, useful to the readers of this paper, will be 

 found in the ' Phil. Trans.' 1805, pp. 378 et seq. 



Eotahnai extraded from A. d'Orhiynifs ' Foramrniferes fossiles du 

 Bassin tertiaire de Vienne,' 1846. 



Plate VII. 

 Figs. 19-21. Kotalina kalembergensis. Planorhulina, a compressed variety of 

 PL tuherosa (F. & M.), near PI. Lutemplei (D'O.), but thinner, 



22-24. Hauerii. Pulvinulina near P. auricula (F. * M.). 



25-27. Boueana, Pulvinulina near P. fulchella (D'O.). 



28-30, Partschiana. Pulvinulina near P. ijcruvlana (1)'0.). 



Plate VIII. 



Figs. 1--3. Partschiana. Pulvinulina near P. 'peruviana (D'O.), 



4-6. Scbreibersii. Pulvinulina near P. Alvarczii (D'O.). 



7-0. Haidingerii. Planorhulina, a conical subvariety of PI. tuherosa 



(F. & M.). 



