Risbecia Tryoni Garrett 1873

Tryon's Risbecia

 
Features Large purple/brown spots ringed with white. Thin purple line around edge of mantle
Distribution Tropical western Pacific, Julian Rocks may be the southern limit on the east coast of Australia.
Depth  
Max size 10cms
 

The two individuals above are mating. The two below are exhibiting "trailing behaviour", where one animal appears to follow the mucous trail of another until contact is achieved. long trains can develop. This could be part of their mating behavior.