yes, definitely jellies............ although dating them isn't easy, as they were made for a very long period, and this panel/slice cutting was one of the more common types of decoration in the C19 - different periods in history throw up different styles of decoration These might be anywhere from 1850 onwards, and can be more common than you'd imagine at times - they look to be on the lower end of the scale regarding height.
Generally speaking, if they are without handles they're called jellies - when they have handles they are more usually called custards - although there are exceptions - like everything.
Probably best to describe them as simply clear glass of lead composition - the expression crystal gets applied to so much these days, although most people probably mean 'clear' when they use the word.
