72 MEMOIR IV. 



and widely separated from their real relations the Crustacea. 

 " Behold us" says he " arrived at animals very different 

 from all tlieMollusca of which we have hitherto spoken: — 

 members of a horny texture, in some measure articulated, 

 numerous, susceptible of varied movements, a mouth 

 furnished with lips and jaws, a nervous system formed of 

 a series of ganglions, announce that Nature is about to 

 conduct us to the race of articulated animals" — '^Never- 

 theless as their body is not itself articulated, as we have 

 already in the Teredines, which undoubtedly belong to the 

 acephalous Mollusca, examples of articulated members, 

 as in short the shell of the Lepades seems to be model- 

 led after that of many Bivalves, we think ourselves 

 authorized to leave this Order amongst the Mollusca." 

 Mem. sur les animaux des Anatifes et des Balafies, Sfc. p. 1. 

 Cuvier follows up the comparison of the five valves in Lepas 

 anatifera with those of the Muscle p. 3 and at page 6 

 makes what must now be considered a more just compari- 

 son between these animals and the Crustacea. Mons. 

 Lamarck also, has the Cirripedes as a distinct Class, which 

 with Cuvier he places between the Mollusca and the 

 Annelides. Latrcille in his last work "Families du Regne 

 Animar' assigns them as a Class the same situation, but 

 appears still to consider them as related to the Ostracoda 

 and Branchiopoda of the Crustacea ; that he has not been 

 able to form any decided opinion is evident however from 

 what he says p. 231 " The sessile Cirripedes would 

 appear to represent in this place the animals which 

 terminate the family of the Acephales enfernies of M. 

 Cuvier. The two tubular horns of the Otions (Lepas aurita 

 Linn.) present to us, (but with other uses) the two tubes 

 ot many Acephala ! the tentacula of these last animals are 

 "•onverted into jaws. The cirri are a kind of feet divided 

 into branches, and analogous to the sub-abdominal appen- 

 dages of many Crustacea, and especially the Amphipoda ; 

 we may also compare them to those of many Annelides. 



