»ER II 



FORAMINIFERA 



37 



I 



^^B Dawson, Carpenter and various other authors have referred the so-called 



^^fozoon occurring in crystalline limestone of the Archaean (Laurentian) period 



to the Foraminifera ; biit the elaborate investigations of Möbius have shown 



in, liqn. deL. 



Fig. 31. 



A, Orbitoides papyracea Boubee. Eocene (Ferruginous sandstone) ; Kressenberg, Upper Bavaria, (Greatly 

 enlarged). i Median Chambers ; 2 Lateral Chambers ; « Compact pillars of intermediate skeleton. B, Portion of 

 median transverse seetion, highly magnified ; 2 Lateral Chambers with perforate walls ; 4 Canal - System of 

 cyclical marginal cord ; ^Tabules connecting adjacent Chambers. C, Periphery and profile of same, natural 

 size. D, Orbitoides tenella Gümbel. Eocene ; Kressenberg, (Natural size). E, Orbitoides variecostata Gümbel; 

 Eocene ; San Martino, near Verona. (Natural size.) F, Orbitoides ephippium Sow. Eocene ; Kressenberg. 

 (Natural size.) 



that neither Eozoon nor Archaeosphaerina can be regarded as organic structures, 

 being merely mineral segregations. 



Family 10. Miliolidae Carpenter. 



Test of one or more Chambers, calcareous and porcellanouSj sometimes covered with 

 sand, usually imperforate, hut in some forms with the early Chambers distinctly 

 perforate. 



Subfamily A. Cornuspirinae Ciishman. 



Test planospiral, usually of a proloculum and long coiled 

 Single Chamber. 



Cornuspira Schnitze (Fig. 32). Test composed of numer- 

 ous plano-spiral convolutions ; oral aperture simple, terminal; 

 monothalamous. Lias to Recent. 



Fig. 32, 



Cornuspira polygyra 

 Reuss, Oligocene ; 



Hungary. 



Subfamily B. Nubeculariinae Brady. 



Test irregulär and asymmetrical, the apertures variously placed. 



Nubecularia Defrance. Test at first coiled, later tubulär or irregulär ; 

 attached. Liassic to Recent. 



