56 



CRUSTACEA. „ , 



Revised and added to by C. Spence Bate, F.R.8. 



IN complying with the request of the Council to revise the late 

 Mr. Jonathan Couch's list of Crustacea in his Cornish 

 Fauna, I have endeavoured to retain as much as possible of Mr. 

 Couch's words, and to collect from books and other sources the 

 information that he communicated to various authors on this 

 branch of natural history. 



I have, moreover, included any new forms that have, since the 

 publication of his Fauna, been published as having been found 

 in Cornwall ; and have added from the History of the British 

 sessile-eyed Crustacea, a list of all the animals of that sub- 

 kingdom that have been found on the coast of Cornwall. 



The original portion of Mr. Couch's Fauna will be dis- 

 tinguished by inverted commas. 



It will be seen that the Cornish Crustacea exhibits a very large 

 proportion of the known British forms ; and considering the 

 few places as well as naturalists that have been engaged in the 

 observation of these animals, I think there can be little doubt 

 but that many other forms may yet be added to the local and 

 probably to the British Fauna. 



C. SPENCE BATE. 



Plymouth, Dec. 28th, 1877. 



CRUSTACEA. 



"The class of articulata, or u Artlwopoda" that are known as 

 Crustaceans, in which are included the families of Crabs, 

 Lobsters, Shrimps, Sea Screws and others recognized as Entomos- 

 tracous or Insect Crustaceans, may be popularly described as 

 "animals without an internal vertebral skeleton, but having the 

 body divided into distinct rings moveable on each other by joints ; 

 the integument forms a crust or external skeleton ; antennae or 



