This species is included and figured by Montagu and is currently regarded a synonym of the Caribbean nassariid Phrontis antillarum (D’Orbigny, 1847) by MolluscaBase. Jeffreys (1867, p. 353) regarded it as a synonym of the common British Tritia incrassata (Strøm, 1768).
There are three scars on the mounting card but only one shell is present and this is about half the size of that given by Montagu. Given the small size of the RAMM shell there is uncertainty about its identity with a consensus that it may well be a worn and juvenile Tritia incrassata and that it is not Phrontis antillarum. Montagu stated that he had shells from Pulteney but also from Mr Bryer, all from Dorset.
In January 2020 the Montagu Collection was awarded Designated status by Arts Council England. This mark of distinction recognises the collection’s international significance to the scientific community - it is the most intact and taxonomically important collection of British shells of the early 19th century (1800-1816) to be found anywhere in the UK.