PREFACE. 



Plates 179 and 180 give for the first time complete figures 

 of the living colours, of both sexes, of the Great Red King- 

 Crab of the Colonists, Pseudocarcinus gigas, which greatly 

 exceeds in size and brilliancy of colour any other species of 

 the family Canceridce. 



The succeeding Decades mil illustrate as many different 

 genera as possible, and deal first, usually, with species of some 

 special interest and of which good figures do not exist or are 

 not easily accessible, 



Frederick McCoy. 

 25th May, 1889. 



