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A species of concern include animals such as the hermit crab , sea urchins , periwinkles , and the lightning whelk . The types of snails are moon snails and periwinkles . It is true that the annual periwinkle , called Madagascar vinca , will struggle on in dry , hot , even half-shady circumstances , but it only looks really splendid with some help . She declared that the colors should be pink , periwinkle and thistle — colors I later recognized inside her prized crayon box . It 's best to visit during the cooler months ( April to October ) , when the bizarre pachypodiums and periwinkles are in flower on the rock faces and walking is more comfortable . The envelope that Clark sent to Robert contained twenty-five plant leaves , all from the Madigascar periwinkle plant . Periwinkle plant is now the very acceptable cancer drug , vincristine . In Galway Bay , Ireland , a live limpet or periwinkle used to be placed at the corners of the house to ensure successful fishing . After having proceeded along the street , one of his servants came bringing two collars formed of shell fish , enclosed in a roll of cloth , which were made from the shells of colored prawns or periwinkles , held by them in high estimation ; and from each collar depended eight golden prawns , finished in a very perfect manner , about a foot and a half in length .