AG ORDERS. 
2. Sromapopia, hody-footed. Head distinct 
Jrom the trunk, and divided into two parts ; and the 
Sore part bears the antenne and the moveable eyes ; 
mandibles bearing palpi. 
The gills are plume-like. 
Example. Crawfish. 
3. Ampuipopia, fcet all the length of the body. 
Head distinet fiom the body, being one piece only ; 
eyes immovable ; maniibles bearing palpt. 
The gills or respiratory organs are vesicles si- 
fuated at the interior base of the feet. 
Example. Gammarus. 
4. Isovopia, equal footed. Head generally dis- 
tinet from the trunk ; mouth. composed of several 
jaws ; maniibles without palpi, but the two lower 
jaws resemble a lip bearing two palpi. 
_ Gills cr respiratory organs generally situated 
on the under side of the trunk. ; 
Examples. COniscus, sowbug. 
5. Brancuteopes, gills or respirable organs on 
the fin-like feet. Mouth is sometimes in the form 
of a beak, other times composed of many jaws : 
no palpi. 
Examples. Limulus, cecrops, cyclops. 
VIT. CLASS ARACHNIDA 
18 DIVIDED INTO TWO ORDERS, 
4. Putmonanta, having pulmonary or respira- 
tory sacks. , 
Examples. Aranea or proper spider, mygale, 
tarantula, scorpion. | Are 
2. Tracuenta, respiratory organs are trachee 
or radiated and branched tubes. 
