8 Gastropod anatomy. This design of clothes peg has three points where shells may be gripped, and it has no metal parts to rust. Central peg painted black to prevent colour reflection in photography.

8 Gastropod anatomy. This design of clothes peg has three points where shells may be gripped, and it has no metal parts to rust. Central peg painted black to prevent colour reflection in photography.

Larger species, especially those with short spires, cannot be held by plasticine. Instead, they can be gripped in plastic clothes pegs. To prevent the peg from floating and the snail from moving it, place a piece of lead on it. For photography, paint coloured pegs with black bituminous paint to avoid colour reflections. As individuals of the same species often vary in their willingness to extend, it is advisable to restrain several simultaneously to increase the chance of seeing an example of each sex.
Equipment Source
Ecoforce clothes pegs; use search on Ebay www.ebay.co.uk/
Full article of Anatomy of marine gastropods without dissection. below image 2 2 Gastropod anatomy. Transparent sole of Janolus hyalinus on undersurface of water.