or I wonder if the transcription is "wrong" Silas mis-read as Wilm. ?

http://www.forum.forest-of-dean.net/index.php?mode=thread&id=2670#p2672

Name: Silas Phelps
Year of Registration: 1861
Quarter of Registration: Jan-Feb-Mar
District: Westbury On Severn
County: Gloucestershire
Volume: 6a
Page: 196