English: “Pisom and Raamses” — Rav and Shmuel disagree. One said its name was Pisom, and why was it called Raamses? Because the first [section] would collapse (misroses). The other said its name was Raamses, and why was it called Pisom? Because the first [section] was a mouth of the abyss (pi tehom).
On the daf / in context: See the cited source for the full section.
Type of Learning
Custom — dual etymology of the city names.
What Is Learned
The store-cities were constructed so that the work could never be completed; each portion that was built immediately failed.