ILLUSTRATIONS. IN THE TEXT. 
FIGS. PAGE 
1.—Pelomyxa palustris : portion of periphery ‘ 6 
2.—Amcba proteus: pseudopodia . . . 10 
3.—Inthameeba discus ; pseudopodium ' . 10 
4,.—Biomyxa vagans : pseudopodia . . 11 
5.—Ameba proteus: diagram of pseudopodium . 12 
6-9.— ,, 53 contraction of vacuole . 13 
7.—Hyalosphenia papilio : test : : 17 
8.— Difflugia pyriformis : test. . , . 17 
9.—Sphenoderia fissirostris : test : . 18 
10.—Quadrula symmetrica : test ‘ : . 18 
11.—Trinema enchelis: test . ; . 18 
12.—Microgromia socialis ; reproduction . 24 
13.— Diflugia pyriformes : conjugation : . 25 
14.—Nebela collaris: conjugation. : . 25 
15.—Ameba proteus: dissolution. . . 29 
16.—A. limicola : : > . 56 
17, 18.—Arcella vulgaris: test . , é . 120 
10 5 5 var. gibbosa . , . 120 
20.—A. discordes : ; ; . 128 
21-23.—A. dentata ; . ; ‘ . 127 
24, 25.—A. artocrea : ; ; 5 . 128 
26.—Centropyxis aculeata var. spinosa : . 1385 
27.—C. levigata : : : : . 137 
28.— Arcella vulgaris var. compressa . ; . 1389 
29.—Chlamydomyxa montana: active state . . 141 
30.—C. montana: pseudopodal filaments. . 148 
31.— ,, 3 fragment of body. : . 148 
32.— ,, 9 encisted state : . 145 
