ANIMAL KINGDOM. 307 



CirrhipMespedoncules." Animals, he also says, which have 

 a knotted longitudinal nervous system, articulated limbs 

 with a horny skin, several maxillee in pairs, moving hori- 

 zontally, some even palpigerous, can never assuredly, be 

 MoUusca; neither can white-blooded animals, provided 

 with feet, and having the body enveloped in a mantle or 

 tunic, he Annelides. The truth of these remarks is so ob- 

 vious that I scarcely conceive any person will be inclined 

 to object to them; but M. Lamarck forgets, or at least 

 neglects to observe, that certain Crustacea which ' are 

 destitute of sight, have their head confounded with the' 

 trunk, and their body enveloped in a shell. The genus 

 Pentelasmis of Hill, if well observed, will appear, according 

 to Cuvier, to be a Crustaceous animal, bent roundj and 

 inclosed in a thorax excessively developed. But this is 

 precisely the character of the Bi-anchiopoda Lophyropaoi 

 Latreille. The shells of neither these nor the Cirripedes 

 are truly articulated like those of bivalve MoUusca, but the 

 mantle is only in a manner cleft in fi'ont. The body of 

 both a Pentelasmis and a Daphnia is convex, and ends 

 in a rostriform tube. In both animals the mouth is situ- 

 ated as it were under the head, that is, in the most pro- 

 found part of the concavity of the body. The antennse 

 in both are situated at the sides of the mouth ; in both 

 they are composed of a thick cylindrical stalk, which 

 branches off into twd articulated and ciliated cirri. 



The manner in which, according to Degeer, the Dapk^ 

 riia uses its feet and tail to direct its food to its mouth is 

 exactly similar to what may be observed in the Cirripeda. 

 Each has five pair of feet branching off into articulated 

 fringed cirri. The pyramidal processes which Cuvier 

 considers to be the branchias of the Cirripedes, and which 



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