458 EXTERNAL ANATOMY OF INSECTS. 
nose, behind those two mammillz before . described?, 
which form the internal covering of the rhinarium. 
Before I call your attention to what I would denomi- 
nate an zmperfect mouth, in which some one or more of 
the seven organs above enumerated exist under another 
form, or only as rudiments,—I must say something upon 
the mouth of the Myriapods and Arachnida, in which 
there seem to be redundant organs of manducation.— 
M. Latreille, in the Essay lately quoted, in which, 
though some of his notions seem fanciful, he has shown 
a vast depth and range of thought and research, has 
asserted,—ifrom the admirable and curious observations 
of M. Savigny, and those which since their publication 
he has made himself,—that the masticating organs of 
annulose animals (called by him condylopes) are a kind 
of legs’, And M. Savigny, whose indefatigable labours 
and unparalleled acuteness have opened the door to a 
new and vast field in what may be denominated analo- 
gical anatomy,—has observed, that with certain Apiro- 
pods* the organs that serve for manducation do not dif- 
fer essentially from those which, with the other Apiro- 
pods and the Hexapods, serve for locomotion*: and the 
unguiform mandibles of the larvee of certain Diptera, 
you have before been told, are used not only in mandu- 
cation, but also as legs*. These remarks will satisfac- 
torily prove to you, that organs which at first sight pos- 
sess no visible affinity or analogy—as for instance, jaws 
and legs—may, if traced through a long series of beings, 
* See above, p. 455. > Organisation &c. 182. 
* Under this name M. Savigny includes the Myriapoda, Arach- 
nida, and Crustacea. Anim. sans Vertébr. I. i. 40. 
4 Ibid. 43. 
© Vor. II, p. 272—. Also see above, p. 121—. 
