The date does not coincide with the location. This was originally recorded as 17/09/1874. They were at the Aru islands on the 17th September 1874 and Port Jackson between April and June 1874. The Modiola genus was not recorded in the summary Challenger report at Aru Islands but and Modiola glaberrima (now Arcuatula glaberrima) was the only species of the Modiola genus to be recorded at Port Jackson, making Port Jackson the more likely location. This identification would need to be checked.