Your notes should look like this ...
1. C.
2. A.
3. B.
No? Stick with the stuff your mum taught you then.
The animals I was referring to were the elephant fish, the nudibranch (butterfly of the sea) and the cephalopod (literally head-foot in Latin) - in this case a squid. So, what were the pictures then?
1.
These are squid eggs clustered on a weedy rock. Each egg is about 50 mm (2
inches) long. Squids are cephalopods - that is, they have a head and many feet but not a
lot else.
2. 
This thing is the egg case of an elephant fish. The egg stays in here and grows while the case is wafted around in the ocean. Eventually a baby elephant fish pops out. Divers occasionally find empty egg cases (such as this one) washed up in weed dumps along the coast.
3. 
This is a rosette of nudibranch eggs. I have seen them in yellow, white and mauve colours. Archidoris wellingtonensis, the warty nudibranch, laid yellow eggs for the Victoria University Marine Lab.
Now was that too devious? I suppose I really wanted to highlight some of the interesting things I had come across diving. You can bet that the person who tried to tell us that the brown thing had something to do with elephant's eggs, took a lot of ribbing. There were some stunned looks when she showed us a picture of an elephant fish with its egg case in her reference book.
About the smoke? Well, that was just corroborative detail to give an air of verisimilitude ...
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