Which excerpt from the passage contains a paradox and a pun? “my part would not be out of place.” “larger railway stations in london.” “i merely desire information.” “whose origin was a terminus.”

In the excerpt "whose origin was a Terminus," Terminus refers to the end of a railway; however, terminus can also mean the final point, or end of something. Because the word terminus means the end, it is a pun; this fact makes the sentence a paradox as well because saying the origin was a Terminus, is like saying the beginning was an end—which is a seemingly contradictory statement that only makes sense with one meaning of Terminus. 

 "whose origin was a Terminus"

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The bell is just a signal that the set time of the end of class is passing. the teacher lets you know when it's okay to leave.