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could be a cross. they do cross fairly easily. Could also be a cross with the dooja, another round native lime with tear shaped 'sacks', but usually has bumpy skin. It has slightly larger foliage than FL and more glossy and generally a higher oil content. It looks like the 'Sydney hybrid' of the same parentage. http://www.citrusvariety.ucr.edu/citrus/virgata.html
Luckily I had another one of each fruit to cut in half and take pics of today.I ate them with miracle fruit, which is my favorite combo.I suppose the round type has different juice sacks...more tear drop shaped...where elongated type has the caviar appearance.Both are delicious...and a bit different.The elongated type doesn't produce as many seeds...the fruit in the picture was seedless.