Taxacom: proper name for type of glass dish

[John Grehan]

For examining bug dissections in fluid I have a small 4cm square, 1 cm
high, glass block, with a round concave inner surface. Its been more than a
decade outside professional environments and I have forgotten the proper
name for this dish so I can see about procuring more. I would be grateful
for any reminder on the name.

Many thanks,

John Grehan

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