262 
HISTORY OP BRITISH CRUSTACEA. 
branchial, that is, formed for breathing with. The animals 
of this family swim on their backs. Dr. Baird records 
seventeen species from various parts of the world in his 
monograph of the family Proceedings of the Zoological 
Society for 1852'). 
Gen. 138. CHIBOOEPHALTJS ,* Prevost. 
Abdomen large, of nine segments, and ending in ~a tail 
formed of two well-developed plates ; lower antennse in the 
male cylindrical, and furnished at the base with fan-shaped 
and digitiform appendages. 
Chirocephalus diaphanus, Prevost. Fairy Shrimp . 
(Plate XY. fig. 2.) — An inch and more long when adult, 
and nearly quite transparent. Tail bright red; the large 
basal joint of the antennee of a transparent bluish-green 
tipped with red ; the back of the female is blue. (Pig. a is 
the male, fig. b the female.) 
Hab. Pools on Blackheath, Epping, Brighton, Hammer- 
smith, Bristol ; Devon, near Chudleigh. 
Dr. Baird says that this species is found in stagnant 
water, very often in the ditches and deep cart-ruts on the 
edges of woods and plantations. He states that the only 
* Xup, a hand, and K.s<$>aAy\, a head. 
