56 
CRUSTACEA. 
Bevised and added to by O. Spence Bate, F.R.8. 
I N 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 wiU 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. 
CRTJBTACBA. 
“The class of articulata, or ‘■‘ArthropoM' 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 ; antennm or 
