ILLUSTKATIONS TN THE TEXT 



FIGS. PAGE 



33. ? Dijflugia oblonga : test . . .3 

 34. Difflugia acuminata : test . . .3 

 35. Lesquereusia modesta : test . . .3 

 36. Difflugia oblonga . . . .7 

 37. " pyriformis " ? = _D. oblonga . . 8 

 38, 39. oblonga : tests . ... 9 

 40. var. lacustris : conjugation - . 13 

 41. " proteiformis " ? = D. Penardi . 15 

 42-44. acuminata : variation in test . . 22 

 45-47. ,, " bacillariarum . . . 26, 27 

 48-50. ,, varieties . . 29 

 51. ,, " globulosa" ? = D. lobostoma . 36 

 52-54. globulus : various forms of test . 37 

 55. ,, brevicolla : test . . .38 

 56, 57. urceolata : different forms of test 41, 42 

 58, 59. ., lobostoma : oral views of test . . 46 

 60. ,, "proteiformis" ? = D. lobostoma . 47 

 61-63. lobostoma, tricuspis, and gramen : dia- 

 grams of oral view . . .47 

 64. tricuspis . . . .48 

 65. ,, corona . . . . .51 

 66-69. constricta : various forms of test 57, 58 

 70,71. Pontigulasia vas : tests. . . .60 

 72. - compresm . . . .63 

 73. Lesquereusia spiralis . . . .65 

 74. modesta . . . .65 

 75. spiralis : showing the " vermiform 



pellets n . . . . 69 



76. ,, epistomium : test . . .72 



77. Phryganella nidulus . . .76 



78. Cryptodifflugia oviformis . . .79 



