THE ANNALS 



AND 



MAGAZINE OF NATURAL HISTORY. 



[SEVENTH SERIES.] 

 No. lU. JUNE 1907. 



LIV. — On the Classification of the Decapod Crustaceans. 

 By L. A. BoRRADAiLE, M. A., Lecturer in Natural Sciences 

 at Selwyn College, Cambridge. 



In the following pages proposals as to the classification of .the 

 Decapod Crustaceans which I have made in a number of 

 papers during the last few years are stated in a connected 

 form and with certain additions, so as to form a complete 

 conspectus of the higher divisions of the group. I hope that 

 this systematic summary may prove of practical use and 

 tliat some remarks introductory to those portions of it which 

 have not yet been published will be of service as a contribu- 

 tion to the discussion of vexed questions of phylogeny and 

 classification. 



The necessity for keeping the article witliin reasonable 

 limits has compelled me to choose between the ordinary 

 method of stating the diagnostic characters of the divisions of 

 the classification under headings and that known as a '* key." 

 I have adopted the latter as being better suited to bring out 

 the resemblances and contrasts on which a phylogenetic 

 arrangement is based, and because it is of more immediate 

 use to anyone unfamiliar with the group. Questions with 

 wiiich I have dealt elsewliere are not discussed in detail here, 

 Ann. (& Mag. N. Hist. Ser. 7. Vol six. 32 



