MYSIS. 
143 
bone/' and swimming about them freely, seem to enter the 
gullet as it were of their own accord. 
Its swimming-feet are in continual motion, the walking 
feet remaining fixed; it moves along with its body in a 
horizontal line, but occasionally jumps like a little Shrimp. 
Mysis chameleon, Bell. — Middle plate of the tail bi- 
furcate; beak blunt, not more than one-third the length of 
the eye-stalk. 
Abundant on our coasts, as at Weymouth (Professor 
Bell) ; Moray Birth (Rev. G. Gordon) ; Birth of Borth, 
Cumbrae, Lamlash Bay, rock-pools. Channel Islands (Rev. 
A. Norman). 
It varies much in colour, from grey to green and brown ; 
and according to Mr. Norman, is “ certainly by far the most 
common species of the genus." 
Mysis Lamorn^;, Couch. - * — Beak bluntly triangular; 
middle plate of tail deeply bifurcate, and about half as long 
as the second ; antennal scale reaching beyond the peduncle 
of inner antennae. Small and stout species, generally of a 
deep arterial blood-colour ; a very light and active species. 
Mount's Bay. 
Mysis vulgaris, J. Y. Thompson. — Middle plate of 
* Zoologist, Oct. 1856, p. 5286. 
