SYSTEM OF INSECTS. 395 



considered as members of the same Class with the Hex- 

 apods and Polypods at present appears rather problem- 

 atical, and requires further examination. 



DEF. Metamorphosis subcomplete a . 



Body consisting of numerous segments. 



Mouth perfect 5 . 



Eyes compound or aggregate. 



Antennae distinct. 



Legs six on the trunk, many on the abdomen. 



I must next say something on the Orders of the Arach- 

 nida. Every one, at first sight, sees that spiders and 

 scorpions are separated by characters so strongly marked, 

 that they look rather like animals belonging to different 

 Classes than to the same : these form the two primary 

 Orders of the Arachnida, and they appear to be con- 

 nected by two secondary or osculant ones, on the one 

 side by Galeodes, and on the other by Thelyphonus and 

 Phrynus c . This Class, although there is an appearance 

 of eight legs, is, strictly speaking, of a Hexapod type; for 

 the anterior pair, ordinarily regarded as legs and per- 

 forming their function, are really the analogues of the 

 maxillary palpi of perfect insects. This will be evident 

 to you if you examine any species of Galeodes. These 

 animals, if we look at them cursorily, we should regard 



a The number of segments and legs acquired by these insects in 

 their progress to their last state, distinguishes their metamorphosis 

 from that of other Aptera, and requires a distinct name. 



" VOL. III. p. 417. 



When I said (VoL, III. p. 31.) that Phrynus probably belonged 

 to the true Arachnida, it escaped my recollection that Latreille had 

 placed that genus there. 



