4 adjectives to describe porthole

The steamer in which we are to proceed to-morrow looks very small, with diminutive portholes.

"Look out for the wash," warned Merritt, as the great black bulk, pierced with hundreds of glowing portholes, ploughed regally by them, her deck crowded with curious passengers.

Baldly though it was told, there was the square, strong tower with its door six feet from the ground, its machicoulis, its narrow portholes over against him, to give life and vividness to the story.

Completing the square, to the south and west stretched a chain of oak posts set close together and pierced, as were the other walls of the stockade, by numerous portholes.

4 adjectives to describe  porthole