x LIST OF THE PLATES. 
PLATE 
LXII.—Figs. 1, 2.—Cryptodiflugia eboracensis. 
Figs. 
8, 4.—Hyalosphenia 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.— Cochlio- 
podium obscurum. 
LXIII.—Figs. 1, 2.—Pontigulasia rhumbleri. Figs. 3-7.— 
Nebela scotica. Figs. 8, 9.—Cochliopodium ob- 
scurum. Figs. 10, 11.—C. granulatum. 
ILLUSTRATIONS IN THE TEXT. 
FIGS. 
161.—Arcella vulgaris var. hemispherica 
162,163— ,, catinus . 
164-166.— Pyaidicula operculata . 
167.— ‘5 cymbalum 
168, 169.— Parmulina cyathus 
170, 171.—Diplochlamys timida ' 
172.—Difflugia constricta var. spinifera . 
173.— Quadrulella symmetrica var. irregularis 
174, 175.—Cochliopodium granulatum 
176.—Pywidicula operculata . 
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