292 
Psyche 
[September-December 
Figure 1: Diagram to illustrate the orientation of the gerrid leg with reference 
to the simple cylinder shown in (a). Reorientation of the coxal axis causes the 
dorso-ventral axis of the leg to become the anterior/ posterior axis (b). The 
trochanteral bend causes the anterior/ posterior axis of the distal part of the 
leg (c) to become the medio/ lateral axis (d). (b) and (c) represent the same leg 
but viewed from a 90° shift so that the medio/ lateral axis can be seen in dia- 
gram (c). 
A 
anterior 
M 
medial 
C 
coxa 
P 
posterior 
D 
dorsal 
T 
trochanter 
F 
femur 
V 
ventral 
L 
lateral 
The orientation symbols used in this diagram are used similarly in succeeding 
diagrams, unless otherwise stated. 
