Alvania jeffreysi
Alvania jeffreysi is a species of minute sea snail, a marine gastropod mollusk or micromollusk in the family Rissoidae. Description. The species was described from a specimen found in sand dredged north of Unst, Shetland Islands, Scotland from a depth of . It was named in honour of conchologist and malacologist John Gwyn Jeffreys. The maximum recorded shell length is 2.3 mm. Habitat. Minimum recorded depth is 264 m. Maximum recorded depth is 264 m.