ANIMAL KINGDOM. 311 



ing truly Annulose, and it is thus therefore demonstrated 

 that they are on the point of assuming some other of the five 

 general forms described in the fourth chapter of this Essay. 

 The close affinity which has been shown to exist between 

 Daphnia and Pentelasmis may have led us to suspect that, 

 although consisting of pedunculated animals, this last genus 

 approaches the nearest of the known Cirripeda to the 

 Annulosa. The singularly radiated forms of the sessile 

 Cirripedes are also so completely different from that of 

 any Insect or Crustaceous animal, that we are of necessity 

 induced to look to this radiation as the index of the new 

 form about to be adopted ; and the rather, because when 

 the Cirripede has quitted entirely die external form of an 

 Annulose animal, then that distinguishing character of the 

 group, their sessile nature, sometimes disappears as in the 

 genus Acasta, where the cupshaped base is not particu- 

 larly fixed to any foreign body. 



Making, then, due allowance for the hiatus which may- 

 occur between the Cirripeda and the next type of form, 

 we are now to inquire whether any animals have been re- 

 marked by naturalists to bear an affinity in general ap- 

 pearance to the sessile Cirripedes of Lamarck. No shell 

 of a Mollusque has the slightest resemblance to a Balanus, 

 unless indeed it be that of the genus Fissurella. But, to 

 say nothing of the animals, these shells even are totally 

 different in their construction, and the valves of the oper- 

 culum in the Balanus throw a distance between it and 

 every Mollusque, which must be apparent to the most su- 

 perficial examiner of their respective forms. The authors 

 of an excellent description of British shells, therefore, knew 

 no other way to describe some of the more remarkable of 

 the sessile Cirripeda, such as Coronula, than by com- 



