262 HISTORY OF 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. CHIROCEPHALUS * Prevost. 



Abdomen large, of nine segments, and ending in a tail 

 formed of two well-developed plates ; lower antennae 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 antennas 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 



* Xeip, a hand, and Ke<paX-q, a head. 



