The New England Historic Genealogical Society has added images from 33 volumes of registers from the following seven parishes to its browsable Massachusetts Roman Catholic Archdiocese of Boston, 1789-1900 collection on AmericanAncestors.org:
St. Anthony of Padua (Cohasset) Baptisms, 1886-1900
St. Joseph (Pepperell) Baptisms and Marriages, 1885-1900
St. Patrick (Roxbury) Baptisms and Marriages, 1836-1900; Confirmations, 1871-1900
St. Mary of the Assumption (Brookline) Baptisms and Marriages, 1852-1900; Marriages, 1857-1900; Confirmations, 1855-1900
Mary Immaculate of Lourdes (Newton) Baptisms, 1893-1900
Sacred Heart (Newton) Baptisms, 1890-1900
St. John the Baptist (Quincy) Baptisms and Marriages, 1863-1900; Confirmations, 1868-1900; First Communions, 1863-1900.
If you're not an NEHGS member, you'll find the browsable collection can be accessed free of charge by researchers with a free Guest account. This is easy to set up via the Sign Up button.