OF THE ANNULOSA. 351 



antennae or distinct annular segments to the body, while 

 it resembles an insect in form as well as in the possession 

 of two eyes and six articulated feet. 



Articulation is not very distinct in some of the Epizoaria 

 of Lamarck, but sufficiently so to lead us to the Calio-i of 

 Miiller and the genus Cecrops of Dr. Leach, the latter of 

 which by its general form, antennae, structure of the feet, 

 and want of posterior appendages, prepares us for the Ano- 

 plura. These are all parasitical insects, which we quit for 

 the genus Smynthurus of Latreille, and by means of it en- 

 ter among the Thysanura or Annulose animals possessing 

 peculiar organs of locomotion in addition to six feet. 



Some of the Thysanura, such as the Lepisma of La- 

 treille, have an elongate form, long setiform antennae, va- 

 rious small appendages on each side representing false 

 feet, together with articulated setae terminating the poste- 

 rior part of the body. And thus we come to the larva 

 state of the Chilopoda, or Scolopendra of Linnaeus, from 

 which, bearing in recollection the form and structure of 

 the genus Craspedosoma of Leach, we return to the Chi- 

 ibgndlha and complete the circle of Ametabola. 



The Chilopoda are carnivorous animals, with setaceous 

 antennae composed of many more articulations than those 

 of the Chilognatha. Their mouth comprises a labium 

 answering to the clypeus of insects, two mandibles, 

 and a quadrind labium, which may here serve the pur- 

 pose of an upper lip, although M. Savigny is of opinion 

 that it represents in fact the four upper maxillae of deca- 

 pod Crustacea. M. Latreille has lately proposed a diffe- 

 rent theory on this difficult subject ; but there are evident 

 objections as yet to both opinions. * It is certain, notwith- 

 standing, that the manducatory organs of a Scohpendra 



