TABLES 



1 Oxygen Consumption of Siphonophores. . .-page 11 



2 Corrected Volumes of Pneumatophore Gases.. .18 



3 Diffusion of Carbon Monoxide Across Pneumatophore 



Walls . . . 23 

 B-l External Dimensions of Pneumatophores. . . 42 

 B-2 Evaluation of Pneumatophore Volume 



Measurements. . „ 43 



ILLUSTRATIONS 



1 Drawing of Nanomia bijuga. . .page 6 



2, 3 Drawings of intact colonies of Rhizophysa sp. . . . 8 



4 Photograph of living specimens of Rhizophysa sp. . . 



5 Diagram of micrometer respirometer. . . 13 



6 Rate of oxygen uptake by a siphonophore. . . 14 



7 Photograph of pneumatophores of N. bijuga. . . 16 



8 Depth fluctuations of collecting net. . . 20 



9 Work of secreting gas against hydrostatic 



pressure. . . 26 



Al Scholander gamma-burette analyzer. . .38 



A2 Scholander dissolved-gas analyzer. .. 4 



