LIST OF PLATES. 
Plates. To face pages 
I—II. Holden and Harper on Coleosporium 
sonchi-arvensis . , , . 80, 82 
III-VIII. Blake on Arizona diatomite . 108, 110 
IX. Marsh on Canthocamptus . . 116 
X-XIII. W. S. Marshall on a Parasitic Os- 
tracod . . 138, 140, 142, 144 
XIV-XVIII. Ruth Marshall on Arrenuri 
164, 166, 168, 170, 172 
XIX-XXIX. G. W. andE. G. Peckham on Attidae 
258, 260, 262, 264, 266, 268, 270, 272, 274, 
276, 278. 
XXX-XXXIII. Lehmann on Cyclops . 288, 296, 298 
