The presence of an operculum seems to have been of importance, as out of twelve specimens of Cyclostoma elegans, which is thus furnished, eleven revived. It is remarkable, seeing how well the Helix pomatia resisted with me the salt-water, that not one of fifty-four specimens belonging to four other species of Helix tried by Aucapitaine recovered.
Ehun moluskuetatik 27 zuzpertu egin ziren. Operkulua edukitzeak bere garrantzia izan zuela dirudi, Cylostoma elegans operkuludun 12 aletatik 11 zuzpertu baitziren. Aipagarria da, nire esperimentuan Helix pomatia-k gesalari zein ongi eutsi zion kontuan harturik Aucapitaineren esperimentuan Halix horren beste lau espezietako 54 aletatik bat bera ere ez zuzpertzea.