196 HANDBOOK OF PROTOZOOLOGY 



Test with a central chamber and two or more arms; fossil and 



recent Family 1 Astrorhizidae 



Genus Rhabdammina Sars (Fig. 74, a) 



Test without a central chamber, elongate, open at both ends; 



fossil and recent Family 2 Rhizamminidae 



Genus Rhizammina Brady (Fig. 74, h) 

 Test a chamber or rarely series of similar chambers loosely at- 

 tached, with normally a single opening; fossil and recent. . . . 



Family 3 Saccamminidae 



Genus Saccammina Sars (Fig. 74, c) 



Test two-chambered, a proloculum and long undivided tubular 

 second chamber 

 Test with the second chamber, simple or branching, not coiled; 



mostly recent, fossils Family 4 Hyperamminidae 



Genus Hyperammina (Fig. 74, d) 



Test with the second chamber usually coiled at least in the young 

 animal 

 Test of arenaceous material with nmch cement, usually yellowish 



or reddish brown; fossil and recent. . . .Family 5 Ammodiscidae 



Genus Ammodiscus Reuss (Fig. 74, e) 



Test of silicious material, second chamber partially divided; 



fossils only Family 6 Silicinidae 



Genus Silicina Bornemann (Fig. 74,/) 

 Test typically many-chambered 



Test with all chambers in a rectilinear series; fossil and recent. . . 



Family 7 Reophacidae 



Genus Reophax Montfort (Fig. 74, g) 



Test planispirally coiled at least in the young 



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



Family 8 Lituolidae 



Genus Lituola Lamarck (Fig. 75, a) 

 Axis of coil usually long, all close-coiled 



Interior not labyrinthic; fossil only Family 9 Fusulinidae 



Genus Fusulina Fisher (Fig. 75, b) 

 Interior labyrinthic; fossil only Family 10 Loftusiidae 



Genus Loftusia Brady 



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



fossil and recent Family 1 1 Textulariidae 



