ORDER II 



FOEAMINIFEEA 



37 



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

 Eosoon occurring in crystalline limestone of the Archaean (Laurentian) period 

 to the Foraminifera ; but the elaborate investigations of Mobius have shown 



"'''•« in, Ita n. del. 



Fic. 31. 



A, Orh'tto'uhs papyraeta Boubee. Eocene (Perniginous sandstone) ; Kressenberg, Upper Bavaria, (Greatly 

 enlarged), i Median chambers ; ~ Lateral chambers ; ■i Compacc pillars of intermediate skeleton. B. Portion of 

 median transverse section, liighly magnified; -Lateral chambers with perforate walls; "i Canal - system of 

 cyclical marginal cord ; s Tubules connecting adjacent chambers. C, Periphery and profile of same, natural 

 size. D, OrhitoUles tencUa Giimbel. Eocene ; Kressenberg, (Natural size). E, OrhUoides variecostata Giinibel. 

 Eocene ; San Martino, near Verona. (Natural size.) F, OrhUoides eiihippium 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 chamhers, calcareous and porcellanons, sometimes covered with 

 sand, usnally imperforate, hut in some forms with the early chambers distinctly 

 perforate. 



Subfamily A. Cornuspirinae Cushman. 



Test planospiral, usually of a prolocidum and long coiled 

 single chamber. 



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

 ous piano-spiral convolutions ; oi'al aperture simple, terminal; 

 monothalamous. Lias to Kecent. 



Pi(i. 32. 



Cornuspinx polygyra 

 Reuss. Oligocene ; 



Hungary. 



Subfamily B. Nubeculariinae Brady. 



Test irregular and asymmetrical, the apertures variously placed. 



Nubecidaria Defrance. Test at first coiled, later tubular or irregular ; 

 attached. Liassic to Recent. 



