 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 <unk> 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 " . ) 
