POLYMORPHINA GIBBA. 253 



Prof. Reuss under the name of (rlobuli-na amijiidaJoides may be taken as repre- 

 senting a subvarietal condition. 



Occurrence. — FohjmorjMna lacfea is a cosmopolitan species, and has a wide 

 bathymetrical range, although it is most at home in the comparatively shallow- 

 waters of temperate latitudes. Specimens obtained from great depths are rare and 

 poorly developed. The geological range of the species extends to the Kimeridge 

 Clay and the Portland Limestone of Dorsetshire (Parker and Jones). Polymorphina 

 lactea has been found by Mr. Charles Moore in a Jurassic marly limestone from 

 Queensland, Australia ('Quart. Journ. Geol. Soc.,' vol. xxvii, pp. 236, 239). It 

 has also been found in the Cretaceous of Bohemia and Russia, in the Gault of 

 Folkestone, and in the Red Chalk of Speeton ; in the Lower and Middle Tertiaries 

 of Northern and Central Germany ; in the Miocene of Piedmont and of Muddy 

 Creek, Victoria ; and in the Pliocene of St. Erth. 



We have specimens in our own collections from the Casterlian and Scaldisian 

 of Antwerp ; and it is found commonly in Pleistocene deposits. In the Coralline 

 Crag we have met with it in every zone examined. It has also been found in the 

 Red Crag of Essex, in the fluvio-marine beds of Southwold and Thorpe, and in 

 the Chillesford beds. 



2. Polymorphina gibba,^ d'Orhigny, 1826. Plate I, figs. 49 — 51. 

 Part I, 1866, Appendices I and II, Tables, No. 49. 



Polymorpha Suhcordiformia vel Oviformia, Soldani, 1791. Testaceographia, vol. i, 



pt. 2, p. 114, pi. cxiii, figs, zz, c. 

 G-LOBULINA GIBBA, d'Orhigny, 1826. Ann. Sci. Nat., vol. vii, p. 266, No. 20 ; 



Modele, No. 6-3. 



— — S.V. Wood, 1843. Morris's Catal. Brit, rosa., p. 62. 



— GLOBOSA, Reuss, 1845. Verst. bohm. Kreide, p. 40, pi. xiii, fig. 82. 



— GIBBA, Eeuss, 1846. In Geinitz'a Grundriss, &c., p. 669, pi. xxiv, 



fig. 84. 



— GLOBOSA, Reuss, 1846. Ibid., p. 669, pi. xxiv, fig. 85. 



— GIBBA, d'Orh., 1846. Foram. Foss. Wien, p. 227, pi. xiii, figs. 13, 14. 



1 Gradations and varieties of Polymorphina, including several so-called " species," namely, 

 P. lactea, gibha, gutta, fusiformis, Burdigalensis, compressa, are comprised in Beissel's ' Foram. 

 Aach. Kreid.,' 1891, pi. xi, figs. 1 — 56, and pi. xii, figs. 1 — 8, under the name P. ^ro^ews, Beissel. 

 Figs. 9 — 16 in pi. xii, under the same name, is a Ramulina. 



Mr. Millett informs us that A. Silvestri, in the " Atti e Eendieonti dell' Accdd. de Sci. Lettere e 

 Arti dei Zelanti," &c., vol. v, 1893, at page 12. under the name of Bulimina pyrula, d'Orb., refers to 

 several figures on pi. v, which may be ascribed to Polymorphina communis, prohlema, gibba, &c. 



