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  I had aTriceratops "lumbar" vertebra with me the other day which I was
showing to a friend of mine who runs a research lab specializing in spinal
cord injury.   One look (literally 5 seconds from the time I brought it
out) and EVERYONE there excitedly said some variant of "you can sure tell
these things are cold-blooded".  (They are neuro people, not thermal
physiologists).  This was new to me but is intuitively appealing.
Ectotherms (or variations thereof) apparently have smaller neural canals
than endotherms of equal size - something I was not aware of.  Whether it
is true or not, I cannot say, but given the fact that these guys have
looked at hundreds of thousands of spinal cord cross sections, it is an
interesting observation.


Richard Hengst
Biol. Sciences
Purdue Univ. / North Central
Westville, IN  46391
phone   219/785-5251
fax     219  785-5355
email   rhengst@purduenc.edu