LIST OF THE PLATES. 

 PLATE 



LXII. Figs. 1, 2. Crypiodifflugia eboracensis. Figs. 

 3, 4. Hyalosph&nia ovalis. Figs. 5, 6. 

 Nebela bigibbosa. Figs. 7, 8. N. lageniformis 

 var. minor. Fig. 9. N. tubulata. Figs. 

 10, 11. Heleopera sordida. Figs. 12, 13. 

 Averintzia cyclostoma. Fig. 14. Gochlio- 

 podium obscurum. 



LXIII. Figs. 1, 2. Pontigulasia rhumbleri. Figs. 3-7. 

 Nebela scotica. Figs. 8, 9. Cochliopodiuin ob- 

 scurum. Figs. 10, 11. C. granulatum. 



ILLUSTRATIONS IN THE TEXT. 



FIGS. PAGE 



161. Arcella vulgaris var. Jiemisphserica . . 13 



162,163. catinus 14,15 



164-166. Pyxidicula operculata .... 19-21 



167. ,, cymbalum ..... 24 



168, 169. Parmulina cyathus ..... 28 

 170, 171. Diplochlamys timida ..... 33 



172. Difflugia constricta var. spinifera ... 43 



173. Quadrulella symmetrica var. irregular is . 62 

 174, 175. Cochliopodium granulatum .... 68 



176. Pyxidicula opcrculata . . . . .71 



