More goodness from Osborn and Mook’s (1921) gargantuan Camarasaurus monograph, again prepared largely for comparison with “ Apatosaurus ” minimus . Last time, I showed you one of O&M’s pubis illustrations. Now an ischium: This shows the left ischium AMNH 576o’/Is.4. Left column: proximal aspect. Middle column, from top to bottom: medial, lateral, posterior (no dorsal view was provided). Right column: distal.