PREFACE 



THE Editors feel that they owe an apolo-y and some explanation 

 to the readers of The Cambridge Natural //^/, ,,-_// for tin- .l.-h\ 

 which ha- oei ; Hi-red in the issue of this, the fourth in pi,, 

 order, but the last to appear of tin- ten volumes which coin] 

 the work. The delay ha- : due principally to tin- untimely 



death of Professor AV. F. If. AVddon, who had undertaken t.. 

 write tlie S.-ction on the Crusl Tin- 'h.ip|er on the 



Branohiopoda i- all In- actually left ready for publication, hut it 

 gives an indication of the thorough way in which 1, ( - had intcml.-.l 

 to trt-at his subject. ][> had, however, -upi-rintended the 

 preparation of a number of beautiful illustrations, which >ho\v 

 that he had determined to use, in the main, first -hand kin>\\].'. 

 Many of these figures, have been incorporated in i 1 le by 



Mr. (ieoffr.-y Smith, to whom the Ivliiors wish to , 

 thanks for taking u].. aln.' . moment'e notice, the t.c4, \\hich 



had dropp.-,l from hi- tier's hand. 



A further apo] . to tin- other cont ribuloi- to 



volunn-. Their contribution- be.-n in tyj.e tor man\ 



and owin-j to the inevital^le d--Ia\ - indicated abovi 

 call'-d upon to make old artic]. .-i an uii'jiMietu! 



The appearance of this volume compl--t.- the he Kdr 



embarked on some [t coincide 







--ation of an almo.-t. daily i; 

 ' came u]i " to r,,i n l;rid^e -hmen in 



; 



