Fig. 10. Tritonia diomedea are inconsistent in their ability to stimulate rhinophore responses. Eight rhinophores were established as responsive to seawater with conspecific odour isolated from multiple slugs. Responses were then recorded to odours from a pair of non-mating slugs and a pair of mating slugs. Shown are the mean normalized spike counts with standard errors, for each rhinophore for applications of control seawater, non-mating pair seawater, and mating pair seawater. Lines link non-significant pairwise comparisons between treatments within each rhinophore (ANOVA, followed by Tukey's pairwise mean comparisons, P=0.05); *means significantly different from both other treatments. Conspecific responsive units in the rhinophores did not respond equally to odours isolated from specific pairs of T. diomedea, suggesting that the odours are only intermittently released.