FORAMINIFERA 



197 



Genus Textularia Def ranee (Fig. 75, c) 



Test typically triserial at least in the young of the microspheric 

 form 

 Aperture usually without a tooth, the test becoming simpler in 



higher forms; fossil and recent Family 12 Verneuilinidae 



Fig. 75 a. Lituola naiitiloidea. (After Cushman). 



b. Section through a Fusulina. (After Carpenter). 



c. Textularia agglutinans. X90 (After Rhumbler). 



d. Verneuilina propinqua. X8 (After Brady). 



e. Valvulina triangularis. (After d'Orbigny). 



f. Trochammina infiata. X32 (After Brady). 



g. Placopsilina cenomana. (After Reuss). 



h. Tetrataxis palaeotrochns. X 15 (After Brady). 



i. Spiroloculina limbata. X20 (After Brady). 



j. Triloculina trigonula. X15 (After Brady). 



k. Fischerina helix. X32 (After Heron-Allen and Earland). 



1. Vertebralina striata. X40 (After Kiihn). 



m. Alveolinella mello. X35 (After Brady). 



Genus Verneuilina d'Orbigny (Fig. 75, d) 



Aperture typically with a tooth, the test becoming conical in 



higher forms; fossil and recent Family 13 Valvulinidae 



Genus Valvulina d'Orbigny (Fig. 75, e) 



Test with whole body labyrinthic, large, flattened, or cylindrical; 



recent Family 14 Neusinidae 



