CONTENTS 



Introduction 



Previous work page 249 



Material and Methods 250 



The disposition of the film 252 



The constitution of the skin film . 253 



Notes on the species 



Lycmophora lyngbyei, Kiitz 256 



Cocconeis ceticola, Nelson 256 



C. imperatrix, A. Sch 259 



C.gauiieri,H.v.U 259 



C. wheeleri, n.sp 259 



Navicula sp. ? 260 



Navicula spp - 260 



Gyrosigma (Rhoicosigma) arcticum, Cleve 260 



Note on baleen diatoms 261 



An outline of existing knowledge of whale movements at South Georgia 261 



Summarized observations - 263 



South Georgia, 1928-9 264 



South Georgia, 1929-30 , 266 



South Georgia, 1930-1 268 



South Shetlands, January, 1928 271 



Ice-edge to the south of Africa, 1932-3 271 



The seasonal variation in percentage infection 271 



The seasonal variation with thick film 274 



Correlation with fatness 276 



Summarized conclusions 279 



References 282 



Plate XI following page 282 



