M. OLEAGINEUS. _M._ angulis sulcis inæqualibus, labio interiore
rugoso, costis alternis.
Gualt. Test. t. 49. f. G. d'Arg. Conch. t. 13. f. M.
Habitus et structura _rubeculæ_, at octies major, nec vivide pictus,
sed colore testaceo fasciis fuscis longitudinalibus. Apertura intus
saturate crocea, rugis albis.
Apparently this was the _Triton pileare_ of authors,--not the
Mediterranean shell (_T. corrugatus_) termed _M. pileare_ in the
'Systema.'
M. PILEUS HELVETICUS. _M._ angulis rotundatis, tuberculis conicis,
apertura utrinque canaliculata.
d'Arg. Conch, t. 12. f. D. Rumph. t. 28. f. D.
Testa ovata, admodum inæqualis, adspersa nodis conicis tuberculatis
inæqualibus. Costæ latere antico membranaceæ, primæ 2 oppositæ,
reliquæ alternæ. Color flavus. Apertura hians, antice et postice
canaliculatæ, faux intus striata. Labium exterius dentatum, intus
dilatato-membranaceum.
This suits very fairly the _Triton lampas_ of authors; far better,
indeed, than does the _M. Lampas_ of the 'Museum Ulricæ.'