(a) All last known owners or claimants as disclosed by the records of such court, provided however that if (1) the particular fund does not exceed five hundred dollars, or (2) such last known owners or claimants, with respect to a particular fund, exceed ten in number, or (3) the records of such court fail to disclose the number of owners or claimants with respect to a particular fund with a reasonable degree of certainty, they may be designated and described as a class, to wit, as "last known owners or claimants to the fund or property deposited to the credit of the following entitled actions or proceedings in the United States District Court for the .............. District of New York: (naming the actions and proceedings by their titles as appearing on the original process which instituted such actions or proceedings, or by suitable abbreviations thereof, which shall sufficiently describe such actions and proceedings); and

(b) All unknown owners or claimants, who may be designated and described as "unknown owners or claimants to the fund or property deposited to the credit of the following entitled actions or proceedings in the United States district court for the ............ district of New York: (naming the actions and proceedings by their titles as appearing on the original process which instituted such actions or proceedings, or by suitable abbreviations thereof, which shall sufficiently describe such actions and proceedings)."