152 FORAMINIFERA 



Test with the early chambers quinqueloculine, at least in the 

 microspheric form, later ones added in planes 120° from one 

 another, the third of each series added in the plane of the third 

 preceding and covering it so that the surface of the test is 

 composed of but three visible chambers, interior not labyrinthic ; 

 aperture simple, typically with a bifid tooth. 



Triassic to Recent. 



EXPLANATION OF PLATE 18 



MiLIOLIDAE 



Fig. 



1. Articulina sagra d'Orbigny. X 35. (After H. B. Brady), a, side 



view; b, apertural view. 



2. Tuhinella inornata (H. B. Brady). X 20. (After type figure). 



3. Tuhinella funalis (H. B. Brady), x 20. (After type figure). 

 4-6. Nubeculina divaricata (H. B. Brady), x 40. (After type figures). 



Fig. 5, Apertural end from side. Fig. 6, Showing aperture and 

 teeth. 

 7, 8. Triloculina laevigata d'Orbigny. (After Schlumberger). Fig. 7, 

 a, b, opposite sides; c, apertural view, x 28. Fig. 8, Trans- 

 verse section. X 65. 

 9. Trillina hoivchini Schlumberger. X 35. (After type figure). 

 Transverse section. 

 10. Flintina tiHquetra Cushman. x 7. (After type figure). 

 11, 12. Pyrgo sarsi (Schlumberger). (After type figures). Fig. 11, a, 

 front view; b, side view; c, apertural view. X 12. Fig. 12, 

 Transverse section, x 20. 

 13, 14. Fabnlaria discolithes Defrance. (After Schlumberger). Fig. 13, a, 

 side view; b, apertural view, x 35. Fig. 14, Transverse section 

 of megalospheric form. X 30. 

 15, 16. Nevillina coronata (Millett). X 18. (After Sidebottom). Fig. 15, 

 Interior. Fig. 16, a, side view; b, apertural view. 

 17. Idalina antiqua (d'Orbigny). X 8. (After Munier-Chalmas and 

 Schlumberger) . 

 18, 19. Periloculma zifteli Munier-Chalmas and Schlumberger. (After 

 type figures). Fig. 18, a, side view; b, apertural view. X 12. 

 Fig\ 19, Transverse section. X 16. 

 20. Lacazina compressa (d'Orbigny). X 3. (After Munier-Chalmas 

 and Schlumberger). a, apertural view; h, side view. 



