CONTENTS 



Introduction page 195 



Material 197 



The surface waters of the southern oceans 200 



The species as aduhs 203 



Euphausia lucens 205 



Euphausia vallentini 211 



Euphausia frigida 214 



Euphausia superba 216 



Euphausia crystallorophias 220 



Euphausia hanseni 223 



Euphausia spinifera 225 



Euphausia longirostris 228 



Euphausia triacantha 230 



Euphausia similis 233 



Euphausia similis var. arniata 236 



Euphausia similis var. crassirostris 238 



The relations of the species to one another 239 



Group a 240 



Group d 244 



The southern group 246 



The later larval development of five species 253 



Larval development 253 



Post-larval development 260 



Development of 



Euphausia frigida 264 



Euphausia vallentini 271 



Euphausia triacantha 277 



Euphausia longirostris 285 



Euphausia spinifera 294 



References 304 



Appendix I 307 



Appendix II 319 



