322 THE FLOATING MEDUSA. CHAP. xv. 



ever, to mention a few of those introduced in Messrs. 

 Bate and Westwood's History of the Sessile-eyed 

 Crustacea, for the purpose of confirming the state- 

 ments which we have made as to the indefatigable 

 enthusiasm of Edward in the pursuit of Natural His- 

 tory. It must also be mentioned that the Sessile- 

 eyed Crustacea constitute only a single order, and 

 that on the one side of them there are the Stalk-eyed 

 Crustacea and on the other the Entomostraceous 

 Crustacea. 



There is one point, however, that must be referred 

 to before we conclude this heavy chapter. The im- 

 pression prevailed at one time that the Hyperiidse 

 were parasites of the Medusa or Jelly Fish. In 1862 

 Mr. Bate acknowledged the receipt of a Crustacean, 

 which he denominated Hyperia medusarum. He 

 said, " If I arn correct, this is the first time that I 

 have known it as British." In a subsequent letter 

 (23d December 1863), Mr. Bate said, " It is an inte- 

 resting circumstance that you should have found the 

 Hyperia and Lestrigonus free on the shore ; inasmuch 

 as they have previously only been known as inhabit- 

 ants of the floating Medusa. I wish you would direct 

 your attention further to the subject. . . . Hunt and 

 be successful." 



The Eev. Mr. Norman also communicated with 

 Edward about the same time, and informed him 

 " that the Atylus is not a parasitical species, though 

 there are some Crustacea (Hyperia) which are para- 

 sitical upon Medusa. 



