34 



PEOTOZOA— RHIZOPODA 



PHYLUM I 



Fusulina Fischer (Fig. 22). Test fusiform, laterally elongated like 

 Alveolina, coarsely perforated. Septa of principal chambers undulating, and 



D 



^S^'i 



Fig. 22. 



A, Fusulmn ciilindrica Fisch. Carboniferous Limestone : Sarani.sk, Russia. Natural size. B, C, Same 

 species showing various cross-sections enlarged. D, Enlarged section showing chambers communicating by 

 means of foramina (n, b). 



united so as to form secondary chamberlets. Excessively abundant in 

 the Lower Carboniferous of Europe (Russia), Asia and North America. 



Fig. 23. 



Polydomdla crispa Lam. 

 Pliocene ; Sienna, Italy. 

 (Highly magnified.) 



Subfamily B. Polystomellinae Brady. 



Test Ulaterally symmetrical, nautiloid, the more complex 

 specimens with a well-developed secondary canal system. 



Polystomella Lamarck (Fig. 23). Test regular, equi- 

 lateral, nautiloid, final whorl alone visible from the 

 exterior. Jurassic to Recent. 



Subfamily C. Nummulitinae Brady. 



Test lens-shaped or flattened, higher forms with complex secondary caned system. 



Archaediscus Brady. Test lenticular, unsymmetrical, spirally coiled. The 

 segments irregularly constricted and expanded so as to form chambers. Septa 

 and canal-system wanting. Lower Carboniferous. 



Fig. 24. 



A mphistcgiiia hauerl d'( )rb. 

 Miocene (Leithakalk); Nuss- 

 dorf, near Vienna, a, Exterior 

 views, enlarged ; /), Natural 

 size ; c, Median section, 

 greatly enlarged ; d, Trans- 

 verse section, greatly en- 

 larged. 



Fig. 25. 



Opereuliiia compluntda (Bast.). Miocene; Bor- 

 deaux, a, Natural size ; b, c, Median and longi- 

 tudinal sections, greatly enlarged. 



Pig. 20. 



Heterosti'dina costata 

 Miocene (Leithakalk) : 

 dorf, near Vienna. 



d'Orb. 



Nuss- 



Amphistegina d'Orb. (Fig. 24). Test lenticular, slightly inequilateral, 

 spirally rolled. Whorls divided into chambers by numerous single septa in 



