6 ALLAN HANCOCK PACIFIC EXPEDITIONS VOL.21 



the Royal Netherlands Museum, respectively, for facilitating the study 

 through the loan of valuable material or the comparison of specimens 

 with inaccessible types, and to Drs. Marc Andre, S. C. Ball, A. 

 Lemos de Castro, A. Panning, and Lucia Rossi, curators of collections 

 in the museums of Paris, New Haven, Rio de Janeiro, Hamburg, and 

 Turin, for information concerning type and other specimens in their 

 custody, grateful appreciation is expressed. To Anker Petersen, former 

 staff artist, Allan Hancock Foundation, for color notes on living speci- 

 mens and to Mr. Petersen and Glennis Sayers Clements for the meticu- 

 lous pen-and-ink drawings which illumine the printed text, to Daniel 

 Chapman, William Fortin, Royford George, and Mervin Slawson, 

 photographers, and to Beatrice La Rue Burch, Victoria Louise Smith, 

 and Janet Haig, successive research assistants, for help in cataloguing 

 the collection and in compiling the bibliography, and to Miss Haig and 

 Robert E. Arnal for their careful translations from the French, my 

 warmest thanks. Finally, to Dr. E. Yale Dawson and the late Dr. 

 Raymond C. Osburn for their identifications of the algal and bryozoan 

 associates, respectively, of the decorator crabs, due acknowledgment is 

 made. 



In Memoriam 



Among those who rendered significant service in the identification of 

 new and obscure forms described in these pages, and whose names will 

 always be identified with Pacific Brachyura, are four who did not live 

 to see this work completed : 



Mary J. Rathbun 1860 - 1943 



Steve A. Glassell 1884-1948 



Alida M. Buitendijk 1903 - 1950 



Heinrich Balss 1886-1957 



