Ariophantid Snail, Vitrinula glutinosa (Metcalfe, 1852) of Central-Sarawak / Borneo

Vitrinula glutinosa was described as Helix glutinosa in 1852 by William Metcalfe, who had received the snail shells in November 1850 from the British geologist William John Hamilton. Clearly visible is the double penis on the shell.