Alvania belli Harmer, 1920 † (original description)
Alvania cossmanni Harmer, 1920 † (original description)
Alvania densecostata Harmer, 1920 † (original description)
Alvania dubiosa Harmer, 1920 † (original description)
Alvania enysii (Bell, 1898) † (new combination reference)
Alvania erecta Harmer, 1920 † (original description)
Alvania multistriata (Bell, 1892) † (new combination reference)
Alvania obeliscus Harmer, 1920 † (original description)
Alvania partimcancellata Harmer, 1920 † (original description)
Alvania textiliformis Harmer, 1920 † (original description)
Barleeia propinqua Harmer, 1925 † (original description)
Cingula pentodonta (Kendall & Bell, 1886) † (new combination reference)
Eumargarita belli Harmer, 1923 † accepted as Margarites belli (Harmer, 1923) † (original description)
Littorina littorea var. angulata Harmer, 1920 accepted as Littorina littorea (Linnaeus, 1758) (original description)
Littorina littorea var. complanata Harmer, 1920 accepted as Littorina littorea (Linnaeus, 1758) (original description)
Littorina littorea var. conica Harmer, 1920 accepted as Littorina littorea (Linnaeus, 1758) (original description)
Littorina littorea var. distorta Harmer, 1920 accepted as Littorina littorea (Linnaeus, 1758) (original description)
Littorina littorea var. parva Harmer, 1920 accepted as Littorina littorea (Linnaeus, 1758) (original description)
Littorina littorea var. truncata Harmer, 1920 accepted as Littorina littorea (Linnaeus, 1758) (original description)
Littorina rudis var. reevei Harmer, 1921 accepted as Littorina littorea (Linnaeus, 1758) (original description)
Melampus pyramidalis var. conica Harmer, 1923 † accepted as Ellobium pyramidale (J. De C. Sowerby, 1822) † (original description)
Melampus pyramidalis var. striata Harmer, 1923 † accepted as Ellobium pyramidale (J. De C. Sowerby, 1822) † (original description)
Rissoa ambigua Harmer, 1925 † accepted as Rissoa harmeri Faber, 2018 † (original description)
Rissoa basisulcata Etheridge & Bell, 1898 † (basis of record)
Rissoa boytonensis Harmer, 1925 † (original description)
Rissoa dissimilis Harmer, 1920 † (original description)
Rissoa enysii Bell, 1898 † accepted as Alvania enysii (Bell, 1898) † (source of synonymy)
Rissoa multistriata Bell, 1892 † accepted as Alvania multistriata (Bell, 1892) † (basis of record)
Rissoa pentodonta Kendall & Bell, 1886 † accepted as Cingula pentodonta (Kendall & Bell, 1886) † (basis of record)
Rissoa scutula Bell, 1892 † (basis of record)
Rissoa searlesii Harmer, 1925 † (original description)
Rissoa selseyensis Harmer, 1925 † (original description)
Rissoa suttonensis Harmer, 1925 † (original description)
Scala (Clathrus) proxima (de Boury, 1890) † accepted as Epitonium proximum (de Boury, 1890) † (basis of record)
Scala (Fuscoscala) moorei Harmer, 1920 † (original description)
Scala (Gyroscala) canhami Harmer, 1920 † (original description)
Scala (Gyroscala) inedita Harmer, 1920 † (original description)
Scala (Lepidoscala) de Boury, 1920 † accepted as Lepidiscala de Boury, 1917 accepted as Epitonium Röding, 1798 (original description)
Scala (Lepidoscala) cavelli Harmer, 1920 † (original description)
Scala (Linctoscala) Monterosato, 1890 accepted as Epitonium Röding, 1798 (basis of record)
Scala (Linctoscala) inclusa Harmer, 1920 † (original description)
Scala (Plesioacirsa) chatwini Harmer, 1920 † accepted as Acirsa penepolaris (S. V. Wood, 1872) † (original description)
Trochus (Calliostoma) multistriatus Harmer, 1923 † accepted as Gibbula multistriata (Harmer, 1923) † (original description)
Trochus (Gibbula) pulcherrimus Harmer, 1923 † accepted as Gibbula pulcherrima (Harmer, 1923) † (original description)
Trochus (Gibbula) woodii Harmer, 1923 † accepted as Gibbula woodii (Harmer, 1923) † (original description)
Turbonilla (Pyrgolidium) internodulum var. acuminata Harmer, 1920 † accepted as Pyrgolidium internodulum (S. V. Wood, 1848) (original description)
Turbonilla (Pyrgolidium) internodulum var. conica Harmer, 1920 † accepted as Pyrgolidium internodulum (S. V. Wood, 1848) (original description)
Turbonilla kendalli Harmer, 1920 † accepted as Mormula kendalli (Harmer, 1920) † (original description)

Great Britain for Eumargarita belli Harmer, 1923 † 
Great Britain for Scala (Fuscoscala) moorei Harmer, 1920 † 
Great Britain for Scala (Gyroscala) canhami Harmer, 1920 † 
Great Britain for Scala (Gyroscala) inedita Harmer, 1920 † 
Great Britain for Scala (Lepidoscala) cavelli Harmer, 1920 † 
Great Britain for Scala (Linctoscala) inclusa Harmer, 1920 † 
Great Britain for Scala (Plesioacirsa) chatwini Harmer, 1920 † 
Great Britain for Trochus (Calliostoma) multistriatus Harmer, 1923 † 
Great Britain for Trochus (Gibbula) woodii Harmer, 1923 † 
Great Britain for Turbonilla (Pyrgolidium) internodulum var. acuminata Harmer, 1920 † 
Great Britain for Turbonilla (Pyrgolidium) internodulum var. conica Harmer, 1920 † 
Great Britain for Turbonilla kendalli Harmer, 1920 † 

 Homonymy

 for Rissoa ambigua Harmer, 1925 †

Primary junior homonym of R. ambigua Brugnone, 1873. [details]

 Nomenclature

 for Rissoa searlesii Harmer, 1925 †

Described as a new species, but simultaneously introduced as a replacement name for R. pulcherrima Bell, 1893, non ... [details]

 Remark

 for Alvania cossmanni Harmer, 1920 †

According to Harmer a manuscript name of A. Bell. [details]

 Status

 for Scala (Lepidoscala) de Boury, 1920 †

Although it was flagged as "de Boury, MS, 1919", this is probably only an incorrect subsequent spelling of ... [details]