What does "lib. ii. cap. 25" stand for?

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"Concerning the time, place, and manner of his death, we have little certainty. It is commonly believed that, when a general persecution was raised against the Christians by Nero, about A.D. 64, under pretence that they had set Rome on fire, both St. Paul and St. Peter then sealed the truth with their blood; the latter being crucified with his head downward; the former being beheaded, either in A.D. 64 or 65, and buried in the Via Ostiensis. EUSEBIUS, Hist, Eccles. lib. ii. cap. 25, intimates that the tombs of these two apostles, with their inscriptions, were extant in his time; and quotes as his authority a holy man of the name of Caius, who wrote against the sect of the Cataphrygians, who has asserted this, as from his personal knowledge. See Eusebius, by Reading, vol. i. p. 83; and see Dr. Lardner, in his life of this apostle, who examines this account with his usual perspicuity and candor.