Contents. 



Pag. 



Preface V 



Abbreviations of the titles of literature VI 



Systematic Index XII 



Ordo Cniiiacea (Syinpoda) 1 



Alphabetical Index 200 



Nomenclator generum et subgeneruni 207 



(The bibliography is carried down to February 1. 1913.) 



Preface. 



In regard to the small but very distinct group of malacostracan Crustacea 

 with which this monograph is concerned, special honour may be ascribed to 

 the Russian writer Lepechin and the American Say as clear sighted pioneers. 

 For elaborating our knowledge of the group Henrik Kr0yer of Copenhagen is 

 foremost in the first half of the nineteenth century, while G. 0. Sars of 

 Christiania in the second half outshines all other workers. During the century 

 now current Dr. Caiman and Dr. Zimmer have taken the lead in progress. 

 That many other authorities have done excellent service will be clear from 

 the present summary of their labours, and their various merits will be best 

 estimated by those who have occasion and opportunity to consult the original 

 memoirs. Among zealous and sagacious collectors David Robertson of Cumbrae, 

 helpful as he was to Spence Bate, Anton Dohrn, and other well known students, 

 ought not himself to be forgotten. 



For the last twenty years, and recently with more emphasis than before 

 by precept and practice, I have urged the expedience of assigning the mas- 

 culine gender to all generic names of animals. As, however, the older custom 

 is here followed, the Editor of „Das Tierreich"' obligingly allows me to explain 

 that this is due to the established rules of his vast undertaking, and does not 

 imply any change in my personal opinion. Similarly, the ordinal name Cumacea 

 is retained for old acquaintance sake, although, with the cancelling of the 

 generic name Cum a, the alternative title of Sympoda for the Order invites, 

 and has from some authors of repute received, recognition and approval. 



It is a pleasure to add, though it scarcely needs adding, that in passing 

 through the press these pages have been greatly indebted to the constant 

 care of the editorial staff. 



July 26, 1913. 



Thomas R. R. Stebbing, 



Ephraim Lodge, The Common, Tunbridge Wells. 



