VI TREFACE. 



in bearing testimony, and to whom my best thanks are 

 due for the assistance afforded me, in enabling me to 

 describe these curious and interesting parasitical Crus- 

 taceans. My obligations to the other friends who have 

 assisted me with specimens or information will be found 

 gratefully acknowledged in the body of the work. 



W. BAIRD. 



BAYSWATEU ; 

 December 1849. 



