Seeking references on animals with fully understood nervous systems (??horseshoe crab)

[James Teo]

Another one would be the Medicinal Leech (Hirudo medicinalis) and
although not as well studied genetically as the nematode C elegans, it
is a much more active organism, and its motor systems is very
interesting from that standpoint. 

Here are some references:

Brodfuehrer & Thorogood (2001) Identified neurons and leech swimming
behavior, Prog Neurobiol. vol 63(4): pg 371-81

von Bernhardi & Muller (1995) Repair of the central nervous system:
lessons from lesions in leeches, J Neurobiol. vol 27(3): pg 353-66

Sahley (1995) What we have learned from the study of learning in the
leech, J Neurobiol. vol 27(3): pg 434-45

Brodfuehrer et al (1995) Neuronal control of leech swimming.
J Neurobiol. vol 27(3): pg 403-18

Or a website at
http://soma.npa.uiuc.edu/courses/physl490b/models/leech_swimming/leech_swim.html