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No. 4. Notes on two Aiiiphi|>0(ls of the Genus Corophmm from the 



Pacific Coast, by J. Chester Bradley. With plates 9-13 227-252 



Introduction 227 



Key to the Species of Corophmm 229 



Description of Genera and Species 229-230 



Comparison of the Species 239-241 



Bibliography 242 



Explanation of Plates 244-252 



No. 5. The lucrusting Chilostomatous Bryozoa of the West Coast of 



North America, by Alice Robertson. With Plates 14-24 253-344 



Introduction 253 



Description of Genera and Species 255-315 



Bibliography 316-321 



Explanation of the Plates 324-344 



No. 6. Exuviation, Autotomy and Regeneration in Ceratium, by 



Charles Atwood Kofoid. With 33 text-figures 345-386 



Introduction 346 



Ecdysis ! 347-348 



Exuviation 349-359 



Normal Autotomy in Ceratium 360-374 



Regeneration in Ceratium 377-383 



Bibliography 385 



No. 7. Notes on Some Obscure Species of Ceratium, by Charles At- 

 wood Kofoid 387-393 



Introduction 387 



Description of Genera and Species 388-391 



Bibliography 392-393 



Index 



