{II PODOPLEA—AMPHARTHRANDRIA 61 
Sub-Order 2. Podoplea. 
The boundary between the fore and hind part of the body falls 
in front of the fifth thoracic segment. The appendages of the 
fifth thoracic pair in the male are never modified as copulatory 
organs. 
TRIBE I AMPHARTHRANDRIA. 
The first antennae in the male differ oreatly from those in 
the female, being often geniculated and acting as prehensile organs. 
Fic. 28.—EHuterpe acutifrons, 2, Fie. 29.—First antenna of 
x 70. <Abd.1, Ist abdominal Euterpe acutifrons, 6. 
segment; 7.5, 5th thoracic (After Giesbrecht. ) 
segment. (After Giesbrecht. ) 
Fams. 1-2. Cyclopidae and Harpacticidae, and other 
allied families, are purely free-living forms; they are not usually 
pelagic in habit, but prefer creeping among algae in the littoral 
zone or on the sea-bottom, or especially in tidal pools. Some 
genera are, nevertheless, pelagic ; e.g. Oithona among Cyclopidae ; 
Setella, Clytemnestra, aud Aegisthus among Harpacticidae. 
The sketch (Fig. 28) of Huterpe acutifrons 2 , a species widely 
