X LIST OF ILLUSTRATIONS. 



Page. 

 Fig. 30. Textularia inconspicua. X 70. a, front view; b', apertuxal view; 



c, apical view (after Brady) 19 



31-33. Textularia folium. 31, front view. X 125. 32, early chambers 

 viewed by transmitted light, showing broadly oval proloculum 

 with a spine. X 125. 33, specimen with spherical proloculum, 



by transmitted light. X 175 19 



34-35. Textularia aperturalis. 34. X 30. 35, a, front view; b, side view; 



r. end view. X 20?. (Fig. 35, after Goes) 20 



36. Textularia flintii. X 40. a, front view; b, apertural view 21 



37. Textularia crescentiformis. X 75. a, front view; b, side view 



showing the distinct curvature of the test; c, apertural view 22 



38. Textularia concava. X 60. a, front view; 6, apertural view 22 



39-40. Textularia catenata. 39, a, front view; 6, apertural view. X 60. 



40, another specimen, microspheric, by transmitted light, show- 

 ing the microspheric proloculum followed by four chambers in 



a coil before the biserial condition is taken on. X 120 23 



41. Textularia crassisepta. X 60. a, front view; b, apertural view. . 24 



A2-AA. Textularia quadrilatera. 42, megalospheric form; a, front view; 

 b, side view; c, apertural view. X 60. 43, optical section 

 through the early chambers of a megalospheric specimen. X 60. 

 44, optical section through the early chambers of a microspheric 



specimen. X 275 25 



45. Textularioides inflata. X 30. c, front view; b, end view . . 26 



46-48. Bigenerina nodosaria. X 35. 46, a, front view; b, end view. 

 47, a, front view; b, end view. 48, longitudinal section of the 

 test (after Brady) , 28 



49. Bigenerina digitata. X 30. a, front view; 6, apertural view 28 



50. Bigenerina arenacea. X 30. o, front view; b, apertural view 29 



51. Pavonina flabelliformis. a, front view; 6, apertural view. X75.. 30 



52. Pavonina flabelliformis. Young specimen viewed by transmitted 



light. X 150 31 



53. Bolivina punctata. X 100. a, apertural view; 6, front view... 32 



54. Bolivina dilatata. X 60. a, apertural view; b, front view 33 



55. Bolivina seminuda. X 60 34 



56. Bolivina beyrichi. X 50 (after Brady) 35 



57. Bolivina beyrichi, var. alata. X 60. a, apertural view; b, front 



view 35 



58. Bolivina compacta. X 120. a, front view; b, end view 36 



59-60. Bolivina robusta. 59, spineless variety with deeply lobed chamber 



margin. X 100. 60, typical specimen with apical spine and less 



deeply lobed margin. X 70 37 



61-62. Bolivina semialata. X 75. 61, type-specimen. 62, another 



more regular specimen from the same region 38 



63. Bolivina schwageriana. X 65. a, apertural view; b, front view.. 38 



64. Bolivina nobilis. X 40. a, apertural view; b, front view 39 



65. Bolivina karreriana. X 80. a, apertural view; b, front view 40 



66. Bolivina karreriana. var. carinata. X 60. a, front view; b, aper- 



tural view (after Millett) 41 



67. Bolivina pusilla. X 60. a, front view; b, apertural view 41 



68. Bolivina hantkeniana. X 60. a, apertural view; b, front view. . 42 



69. Bolivina amygdalseformis. X 75. a, apertural view; b, front 



view 43 



70. Bolivina semicostata. X 75. a, apertural view; b, front view. . . 44 



