She is likely to be the same person, as 'H. Clothier, High Street, Roslyn' on Sheet 61.
Notes provided by Helen Edwards, who has carried out extensive research on the women who signed Sheet 156, including mapping where they lived. Download pdf of this research here.
Harriet Clothier [H. Clothier, Roslyn] (No. 39)
Land description: Part allotment 2, Section 8, Block 5, Township of Roslyn. Address: 158 Highgate. Age in 1893: 27 years.
Henry Clothier, newsagent and contractor, married Margaret Mary Agnes Quinn in Dunedin in 1865. Harriet, born in 1866, was the eldest of their eight children. Henry purchased his first quarter acre of Roslyn land from James Kilgour in 1872, and in 1880 bought a section further along the block from Archibald Hill Jack. Harriet’s mother died in 1891, and in 1894 her father married a widow, Margaret Ann Sherriff, who drowned herself in the household’s well in 1895. In 1896 he married his third Margaret, who outlived him. Harriet married William Murdoch Somerville in 1894. He was a Scot who arrived in New Zealand about 1889. They had four children. She died in Dunedin in 1941 at the age of 75, and William in 1949, aged 88 years. They are buried in the Andersons Bay Cemetery. Harriet also appears on Sheet 61 as: H. Clothier, High Street, Roslyn.