 There is considerable variety in both the overall shape and the cross section of the love dart . The morphology ( shape and form ) of the dart is species @-@ specific . For example , individual snails of the two rather similar helicid species Cepaea hortensis and Cepaea nemoralis can sometimes only be distinguished by examining the shape of the love dart and the vaginal mucus glands ( which in the anatomical diagram are marked " MG " and are positioned off the structure marked " V " . ) 
