The second bone is a centrum with the attached neural arch. This is only the second bone pair we have found, as normally the neural arches separate from the centrums at the cartilage joint. This bone pair is not only complete, it has the bumps on the side where the ribs connect to the backbone [diapophysis and parapophysis] and the bumps where the neural arch connects to the ones before and behind [anterior and posterior zygapophyses]. Very nice bumps - I really need to know how to pronounce the names. Both of these bones will be scanned next at Century High school after spring break.
So here are some pictures, the result of six weeks of work, 3 days per week:
First the forth braincase by itself:
Next, the third and forth braincases side-by-side