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/12067784
[syn. Pleurotomaria hirasei]Emperor's or Hirasei's Slit ShellPleurotomariidaeRareBohol, The PhilippinesH: 58 mm; W: 65.5 mmThis was an unexpected gift from a friend in The Philippines.NOTE: I have not collected live shells since the mid-1970's. I believe that the animal itself is much more valuable alive than destroyed for its shell.
Cradley, Malvern Worcs. SO729470 Trochulus striolatus. The species varies a fair bit, but features visible are quite coarse growth lines (top view), an angulation, almost a keel, on the periphery (equator) of the final whorl (side view), and a large umbilicus with the lip of the aperture overhanging it a bit (base view). Prop the shell so the base view is flat onto it/the umbilicus if present, not at a slant