Biographical help

[David Weishampel <dweisham@xxxxxxxxxxxxxxxxxxxxxxx>]

As a new subscriber to Paleonet, I hesitate to join in with a query about
some basic information.  However, I have exhausted more conventional
sources and taking my quest "on the road". 

Can anyone help me with biographical information and/or references on the
following: 

The Viennese paleontologist Gustav A. von Arthaber 

The Dutch functional morphologist and comparative anatomist Jan Versluys

The Austrian paleontologist Emanuel Bunzel

The South African paleontologist Egbert Cornelius Nicolaas van Hoepen

The German paleontologist Gustav Steinmann 

The ?Brazilian paleontologist J. Barbosa Rodrigues

The Russian paleontologist N. N. Iakovlev 

The ?German anatomist E. Heidsieck 

The ?German anatomist Eggeling
  
The French paleontologist FrŽdŽric Roman 

Thanks very much in advance for all your help.  

Dave Weishampel
Cell Biology and Anatomy
The Johns Hopkins University
School of Medicine
Baltimore, Maryland 21205
U.S.A.
dweisham@welchlink.welch.jhu.edu