In the ministers black veil: What is the dreadful hour referred to in lines 158-164? What veil is snatched from their faces?

The thing being described here is the page number. if you are talking about a short passage rather than a novel, you want to put the line number in parentheses.

Band c, i believe.. 

Jostle means to shove your arm (or push) against someone roughly in a crowd.  hope this you out