498 PROTOZOOLOGY 



Genus Reophax Montfort (Fig. 209, g) 



Test planispirally coiled at least in young 



Axis of coil, short; many uncoiled forms; fossil and recent 



Family 8 Lituolidae 



Genus Lituola Lamarck (Fig. 210, a) 



Axis of coil usually long, all close-coiled 



Interior not labyrinthic; fossil only Family 9 Fusulinidae 



^Hs 



Fig. 210. a, Lituola nautiloidea (Cushman); b, section through a 

 Fusulina (Carpenter); c. Textularia agglutinans, X90 (Rhumbler); d. 

 Verneuilina propinqua, XS (Brady); e, Valvulina triangularis, (d'Or- 

 bigny); f, Trochammina inflata, X32 (Brady); g, Placopsilina cenomana 

 (Reuss); h, Tetrataxis palaeotrochus, Xl5 (Brady); i, Spiroloculina 

 limbata, X20 (Brady); j, Triloculina trigonula, Xl5 (Brady) ; k, Fischer- 

 ina helix, X32 (Heron-Allen and Earland); 1, Vertebralina striata, X40 

 (Kuhn); m, Alveolinella mello, X35 (Brady). 



Genus Fusulina Fisher (Fig. 210, b) 

 Interior labyrinthic; fossil only Family 10 Loftusiidae 



Genus Loftusia Brady 



Test typically biserial at least in young of microspheric form; fossil 

 and recent Family 11 Textulariidae 



Genus Textularia Def ranee (Fig. 210, c) 



Test typically triserial at least in young of microspheric form 



Aperture usually without a tooth, test becoming simpler in higher 

 forms; fossil and recent Family 12 Verneuilinidae 



