@article {45, title = {The Malayan species of Opisthostoma (Gastropoda, Probranchia, Cyclophoridae), with a catalogue of all the species hitherto described}, journal = {The Bulletin of the Raffles Museum}, volume = {24}, year = {1952}, pages = {5-61}, chapter = {5}, url = {http://rmbr.nus.edu.sg/rbz/biblio/24/24brm005-062.pdf}, author = {van Benthem-Jutting, W.S.S.} }