ZOOLOGICAL RESEARCHES. 



MEMOIR IV. 



Oil the Cirripedes or Barnacles ; demonstrating their 

 deceptive character ; the extraordinary 3Ietamorphosis 

 they undergo, and the Class of Animals to ivhich they 

 indisputably belong, 



JVaturalists of the greatest leisure, and the most devoted 

 to their favorite pursuit, as well as those to whom the 

 most opportune occasions present, have seldom to congra- 

 tulate themselves on any other discovery than that of a few 

 7ieiv Genera or Species, rarely on that of a type difficult to 

 associate with those already known, or of a fact altogether 

 new and without parallel ; how highly then ought we to 

 estimate that of the Metamorphoses of the Crustacea, 

 announced in the First of these Memoirs, and those facts 

 now about to be exposed in regard to the Cirripedes, a 

 tribe of marine animals which have long puzzled the most 

 acute and laborious Zoologists. Although both of these 

 JNIemoirs, from the nature of the discoveries made, have a 

 tendency to condense, rather than to extend and amplify 

 our distributions of animals, I nevertheless consider 

 myself as having been highly favored, and feel it incumbent 

 upon me to give them publicity with all the detail of which 

 they admit. 



