280 FORAMINIFERA OF THE CRAG. 



Mariani, von Hagenow, IlanteU, BeuJanf, JlitcJtcock, Cooke, 

 Toutkoiuslcy, Fritel, Prestwich, Fric, Brandt, Hoernes, Gosse, 

 BalhwiU, MiUett, Bertlielin, Miller, Fornasini, Dunikowski, 

 Ghimmo, Sorhy, Huxley. Macdonald, Scliliclit, Ansted, Neumayr, 

 Moseley, Schacko, I)e Amicis, Bervieux, Besliayes, Silvestri, 

 Giofalo, Cafici, Neviani, Sacco, Gorfi, Sehrodt, Gtippy, and others. 



AlLOTIIECA (?), AeISTEEOSPIKA, HeMISTEEEA. (?), HeMISTICTA PHANEEOSTOMtrir, 



Planulina, PoitospiEA, Ptyoostomum, Pylodexia, Ehrenherg. 

 Rhtnchospiea (?), Ehrenhery, Reuss (MS.), Karrer. 

 KosALlNA, d'Orhiyny, Ehrenherg, Reuss, Jones. 

 EoTALiA, Ehrenherg, Eiibler, and Zivingli. 

 EoTALlNA, Seguenza. 



General Characters. — Shell free, coarsely perforate, planospiral, trochoid, 

 rotaliform, or agglomerate; chambers few, inflated, arranged more or less on a 

 spiral plan. Aperture large at the umbilical face of the chambers. 



Probably no single type of recent Foraminifera has attracted as large an 

 amount of attention as Globir/criiia, partly from its exceedingly wide distribution 

 and its extraordinary abundance, but more from the interesting questions of 

 life-history, and even of physical geograph)^, which are associated with its 

 occurrence. 



The type appears to admit of some amount of variation in external characters, 

 though these exist within narrower limits than is often the case; the differentia- 

 tion from the central form being chiefly in respect to the greater or less regularity 

 in mode of growth, the number and sphericity of the segments, and the varying 

 condition of the surface and texture of the shell. 



Whilst conscious that the whole of the modifications arising in these ways may 

 be connected in unbroken series with the central form, and consequently that 

 there is no ground for specific subdivision in any right sense, we are bound to 

 admit the convenience of recognising the names applied by various authors to the 

 more prominent and best-marked forms, and to accord to them a certain sub- 

 specific or varietal value. 



1. Globigerina BtJLLOiDES, (V rhir/nij , 182C. Plate If, figs. 1, 2. 

 Part I, 1866, Appendix I, Table, No. 61 ; II, Table, No. 59. 



Polymorpha, Tulerosa et Glohulifera, Soldani, 179]. Teataceographite, &c., vol. i, 



pt. 2, p. 117, pi. cxxiii, figs, h, i, l, n, o, 

 P ; pi. cxxiv, all the figs, except Z; pi, 

 cxxv ; and half of the figs, in pi. xxxi. 



