Report on the zoological collections made in the Indo-Pacific Ocean during the voyage of H.M.S. 'Alert' 1881-2.London :Printed by order of the Trustees,1884. biodiversitylibrary.org/page/12067692
Oyster drill (Urosalpinx cinerea) boring the shell of a scallop. Five drills were found on the specimen, but one rolled off when the photograph was taken. The drill bores a fine hole through the shell by means of a ribbon-like tongue lined with saw-like teeth, and then sucks out the contents.