PLATE XLIV. 



TEXTULARIA. — BlGENERINA. 



Diam. Page 



Figures 1-3. — Textularia trochus, d'Orbigny, .... 366 



Fig. 1. a, Lateral aspect; b, oral aspect; fig. 2, peri- 

 pheral aspect, . . . x 35 



Fig. 3. Longitudinal section, showing the labyrinthic 



structure of the interior, . . . x 25 



4, 5. — Textularia turris, d'Orbigny, .... 366 



Fig. 4. a, Lateral aspect ; b, oral aspect, . x 18 



Fig. 5. Peripheral aspect, . . . x 15 



>( 5_8. — Textularia barrettii, Jones and Parker, . . . 367 



Fig. 6. a, Lateral aspect ; b, oral aspect ; c, peripheral 



aspect, . • • x 18 



Fig. 7. Longitudinal section, showing the labyrinthic 



interior, . • ■ . x 20 



Fig. 8. Test fractured transversely, . x 30 



_ 9_i3, — Textularia aspera, Brady, . . . x 20-25 367 



Fig. 9. Specimens growing upon a fragment of Rhab- 



dammina. 

 Fics. 10 a, 11, 12 a, 13. Lateral aspect ; b, b, oral aspect. 



14-18. — Bigenerina nodosaria, d'Orbigny, . x 35 369 



Figs. 14, 15. Lateral aspect; figs. 16, 17, oral aspect. 

 Fig. 18. Longitudinal section of the test. 



,, 19-24. — Bigenerina digitata, d'Orbigny, .... 370 



Figs. 19, 20, 21. Lateral aspect ; tig. 22, oral aspect, . x 35 

 Fig. 23. Section of the wall, showing the arenaceous 



structure, . • • . x 60 



Fig. 24. Longitudinal section of the test, . x 35 



