Both appear on the Net. WoRMS has 1844, but the original description is "Not documented".

The BHL has a book by Chenu & Delessert from 1844 (in French), but the species does not seem to be described therein:

https://www.biodiversitylibrary.org/search?searchTerm=Chenu%201844&tinc=&searchCat=&stype=F&lname=&ninc=&vol=&yr=&subj=&sinc=&lang=&col=&nt=&ntinc=&txt=&txinc=&ppage=1&apage=1&kpage=1&npage=1&facet=FacetItemAuthors_Chenu,%20Jean-Charles,&facet=DateRanges_1826-1850&facet=FacetItemKeywords_Mollusks#/titles

Any ideas?

Moshe Erlendur

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