The problem seems to originate with a particular page, at which point the other site pages are recounted again and again (going to about 4900 pages) in this manner:
e.g., Current page: marvel-comics-worldwide-entertainment.php/xml/data/large-darwyn-cooke-here-be-monsters.php
e.g., Current page: marvel-comics-worldwide-entertainment.php/xml/data/xml/data/xml/data/xml/data/xml/data/xml/data/xml/data/xml/data/xml/data/xml/data/xml/data/xml/data/z041-superman-scott-mcdaniel.php
If I remove the page (marvel-comics-worldwide-entertainment.php) from the site and rerun the crawl, I get the accurate page count (1025).
What is wrong with that page?