INTRODUCTION, 



THE principal object of the present Catalogue has been to give 

 a complete list of all the Crustacea that have been recorded as 

 found in Great Britain, indicating at the same time those species 

 that are contained in the collection, and pointing out their pecu- 

 liarities as regards sex, habitat, and the source from whence the 

 specimens were obtained, as far as the materials in the posses- 

 sion of the Museum will allow. The locality of the specimens, 

 which are not at present contained in the collection, is recorded 

 as given by the authority on which they are inserted. 



Those specimens which have been presented to the Museum 

 have the name of the donor indicated. Synonyma have been 

 added to the orders and other divisions of the class, as well 

 as to the genera and species, with a reference to the work in 

 which they have been indicated, and the date, when the 

 different names and divisions were first used, is usually added. 



