FORAMINIFERA 



349 



Fig. 159. a, Lituola nautiloidea (Cushman); b, section through a 

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

 d, Verneuilina propijiqua, X8 (Brady); e, Valvulina triangularis, 

 (d'Orbigny); f, Trocharmnina inflata, X32 (Brady); g, Placopsilina 

 cenomana (Reuss); h, Tetrataxis palaeotrochus, Xl5 (Brady); i, Spiro- 

 loculina limhata, X20 (Brady); j, Triloculina trigonula, Xl5 (Brady); 

 k, Fischerina helix, X32 (Heron-Allen and Earland); 1, Vertebralina 

 striata, X40 (Kiihn); m, Alveolinella mello, X35 (Brady). 



Genus Neusina Goes 



Test trochoid at least while young 



Mostly free; typically trochoid throughout, fossil and recent. . 

 Family 15 Trochamminidae 



Genus Trochammina Parker et Jones (Fig. 159, /) 



Attached; young trochoid, later stages variously formed; fossil 

 and recent Family 16 Placopsilinidae 



Genus Placopsilina d'Orbigny (Fig. 159, g) 



Free; conical, mostly of large size; fossil only 



Family 17 Orbitolinidae 



Genus Tetrataxis Ehrenberg (Fig. 159, h) 



Test coiled in varying planes, wall imperforate, with arenaceous 



portion only on the exterior; fossil and recent 



Family 18 Miliolidae (in part) 



