10 Mr. Lubbock 



Crustacea. Professor Milne-Edwards has indeed proposed one in 

 the Annales des Sciences Naturelles for 1851, but unfortunately 

 it is only applicable to the decapods. The Calanidce possess ten 

 or eleven pairs of appendages ; viz., first two pairs of antennae, then 

 a pair of mandibles, then three pairs which are generally applied to 

 the mouth, and then four or five pairs of natatory legs. Three 

 pairs are therefore wanting ; we may consider them to be those of 

 the first or ocular segment, and of the two posterior segments. I 

 subjoin a table showing the homologies of the genus Pontella, and 

 the names used by different observers. It must be observed that 

 Milne-Edwards appears to consider that the maxillre are wanting, 

 for in his Nat. des C. vol. iii. p. 418, he says, " Les machoires 

 paraissent manquer completement, ou se trouver reduites a I'etat 

 de simples vestiges ;" if this is the case, his " Pates machoires de la 

 premiere paire " belong to the seventh segment instead of to the 

 fifth ; and the missing appendages are those of the first, fifth and 

 sixth segments. 



